From the Hearth to the Gas Stove: A Study in Apricot Marmalade

By Marissa Nicosia

The early modern hearth and the modern gas stove are rather different technologies for controlling heat. Again and again in my recipe recreation work for Cooking in the Archives, I encounter complex instructions for managing cooking temperatures on a hearth and try to translate those instructions to my own equipment. To what temperature should I set my oven? How high should I turn up the flame under the pot? What volume of water should I add when boiling water is called for and no volume is specified? How long should everything cook?

Early modern recipes trust that cooks know their hearth and ingredients well. Some recipes are very precise about weight and volume and others read like general concepts on which a cook might improvise as best suits their needs, inclinations, or tastes. Cooking these recipes on a hearth with variable fire types and temperatures demanded a skilled cook who could manage heat effectively.

This is the part of updating recipes that most challenges me: I have a PhD in English, but no formal culinary training. This is also the part of updating recipes where I have been most challenged by others. Members of the historical reenactment and historical interpretation communities have in turn urged me to try these recipes again on a hearth to taste the different flavors the fire instills and chastised me for attempting to cook these recipes without a hearth in the first place. As I grow as a cook and expand this project, I’m going to accept these kind invitations to cook alongside skilled recreators [1]. But Cooking in the Archives is a project designed to give all readers a taste of the past: even if those readers possess only the tiniest apartment stove. That’s the kind of stove that I had in my West Philadelphia rental when I launched the site with Alyssa Connell in 2014.

In order to cook these recipes on my stove, I have to determine some basic information: Is this something I should make on the stovetop or in the oven? In a pot, pan, or roasting dish? Is the recipe asking for water and should that water be boiled first or with the ingredients? To answer these questions, I naturally start with the recipes themselves. The phrases recipe writers use for the ferocity or gentleness of the fire are subtle, but informative. Then I look at recipes in modern cookbooks. The “Jumball” cookie mix looked like a shortbread cookie so I started with the oven temperature from a familiar cookie recipe and kept track of the time [2]. These are skills that I learned from baking growing up and cooking for myself while I was in graduate school, but not, exactly, skills that I learned in the academy. Neither humanities course work nor historical recreation holds all the answers for how to, say, make an apricot marmalade from a late-seventeenth-century culinary manuscript in a twenty-first century kitchen.

This recipe “To make Marmalaid of Apricocks” is from Ms. Codex 785 at the Kislak Center for Special Collections, Rare Books, and Manuscripts at the University of Pennsylvania. I’ve prepared quite a few recipes from this specific manuscript, and this recipe, like a few others in the volume, derives from Hannah Woolley’s cookbook The Queen-like Closet or Rich Cabinet (1670) [3]. This marmalade is both fragile and delicious. It needs the careful tending outlined in the original recipe. I have attempted to convey this level of care in my updated recipe at the end of this post.

To make Marmalaid of Apricocks

Take Apricocks, pare them and cut them in
quarters and to every pound of Apricocks
put a pound of fine Sugar, then put your
Apricocks in a Skillet with half the Sugar
and let them boil very tender, and gently, and
bruise them with the back of a Spoon, till they
be like pap, then take the other part of the
Sugar, and boil it to a Candy height, then put
your Apricocks into that Sugar, and keep it stirring
over the ffire, till all the sugar is meted, but
do not let it boil, then take it from the ffire,
and Stir it till it be almost cold, then put it
into Glasses, and let it have the Air of the
ffire to dry it.

Images 1 & 2 – The recipe in Ms. Codex 785, 6-7

The recipe asks you to boil the apricots with sugar until the fruit is so tender that it breaks down into a luscious pulp. Then the recipe instructs you to make a simple syrup of sugar and water and allow the mixture to come to candy height or what we would now call the soft-ball stage. Early modern cooks would have been especially skilled at the subtle art of watching sugar change under the influence of heat. The cook is next told to stir the apricot puree into the hot sugar over the fire and then off the fire until the mixture is almost cold. The final instruction: “and let it have the Air of the ffire to dry it” is the most evocative image for me. The preserved apricots in glass containers glowing in front of the hearth.

This apricot marmalade is delicious on toast, lightly crisped by the heat of a toaster oven or toaster, of course.


An Updated Recipe

8 apricots (7 oz, 200 g)

generous 2/3 cup sugar (7 oz, 200 g)

1/3 cup water

Peel the apricots, remove their pits, and cut them into quarters. Cook them to a pulp with half the sugar. The apricots will release their own juices so no water is necessary here. (Approximately 10 minutes.)

Make a simple syrup with the remaining 1/3 cup sugar and 1/3 cup water in a saucepan. Use a candy thermometer to keep track of the temperature and cook until it reaches candy height/pearl stage 240F on the thermometer. When the syrup has reached this temperature, add the cooked apricots to it. Stir to combine over the heat, but do not allow the mix to boil.

Remove from heat and stir as the mixture cools. Transfer into a clean jar. This amount of apricots and sugar nicely filled an 8oz jelly jar.

Keep refrigerated and eat within two weeks. (You can also properly can this for longer storage.)

[1] Johnson’s work in particular suggests what traditional academics can learn by spending time with reenactors and participating in reenactments. Katherine M. Johnson, “Rethinking (re)doing: historical re-enactment and/as historiography,” Rethinking History 19, no. 2 (2015): 193-206.



Harnessing Heat in Greco-Roman and Islamicate Medicine

By Aileen R Das

Associated and sometimes identified with the life-giving (or vital) principle, heat occupied a central place in ancient Greek, and subsequently Roman and medieval Islamicate, theories about the human body and its care. The medical literature surviving from classical Greece shows that early doctors’ understanding of human physiology was greatly informed by philosophical speculations about the basic constituents of the world. Heraclitus of Ephesus (fl. 500 BCE) appears to be the first natural philosopher to give fire a primary role in the cosmos; according to him, everything originates from fire, which undergoes various changes to become the materials that we see around us. His now fragmentary writings do not discuss medical or biological themes, but later ‘Pre-Socratics’ – a modern term that describes Heraclitus and other thinkers before or roughly contemporary with Socrates – such as Empedocles (495–435 BCE) did explain how this element affected the body. Both a physician and a philosopher, Empedocles of Akragas is the progenitor of the four element theory, according to which earth, water, fire, and air are the building blocks of the universe, and he asserted that heat was responsible for sexual differentiation. In his philosophical poem On Nature, Empedocles remarks, ‘For in its warmer part the womb brings forth males, and that is why men are dark, more manly, and shaggy’ (fr. 67).

The authors of the Hippocratic corpus developed several of their therapies in light of the notion that an innate heat sustains essential processes in the body such as growth and digestion. The intensity of this heat supposedly varied not only according to sex – with men being warmer than women – but also from person to person. Thus, when deciding on a course of treatment, the doctor had to make sure that they did not excessively increase or reduce the natural heat of their patients. Dietary regimens were the mainstay of Hippocratic therapeutics, for doctors working in this tradition assigned to food a range of properties (cooling, warming, drying, and moistening, to name just a few) that could influence the condition of the body. For example, the Hippocratic treatise Regimen II recommends that the herb coriander, which is described as being ‘hot and astringent’, be eaten to combat heartburn and to induce sleep.

None of the Hippocratic writers offer an overarching theory of the powers of nutriment and other natural substances. Rather, centuries later the physician Galen (d. c. 217 CE) of Pergamum, who drew on the Hippocratics, their philosophical precursors, and earlier pharmacological writers, formulated a system that ranked the properties of plants, minerals, and animal products. The dividing line between what counted as a drug as opposed to a food was blurry in the ancient (as well as medieval) world, so Galen elaborates his theory in both his dietetic and pharmacological works. On the Powers and Mixtures of Simple Drugs, which lists several hundred one-ingredient drugs, offers the most comprehensive account; it relates that all substances possess a mixture of active (hot or cold) or passive qualities (wet or dry) in four varying degrees of intensity, with the first degree being weak and the fourth strongest. For example, in the entry on the chaste-tree (vitex agnus-castus), Galen reports that the leaves and seeds of this Mediterranean plant is warm and dry to the third degree. By learning the properties and strengths of a range of materia medica, the doctor can select the appropriate remedy that will match their patient’s imbalance. Regarding the power of the chaste-tree, Galen recommends that the seeds be used to dissolve wind in the stomach and to relieve uterine pain, but he cautions that they are so warming that they can cause a headache. Thus, to avoid this affect, he advises that they be ingested with sweetmeats or other dessert items.

While Galen’s theory of the potency of natural substances was extremely influential throughout antiquity and the middle ages, later medical thinkers looked to redress his failure to explain how a doctor (or pharmacist) calculates the right proportion of ingredients in a multi-ingredient (that is ‘compound’) drug to achieve the desired potency. The Muslim philosopher Abū Yaʿqūb ibn Ishāq al-Kindī (c. 801–66), who was not a doctor himself but had sponsored the Arabic translations of Greek medical works, developed a complex arithmetical theory to quantify the strength of a drug that contained varying degrees of warmth, for instance. According to it, a substance’s intensity increases with an increase in degree according to the double ratio. Thus, if one takes a ‘temperate’ drug that has equal parts of warmth and coldness and doubles the parts of warmth, the drug will be hot in the first degree; if the parts of warmth are quadrupled, then the drug is hot in the second degree and so on. With these proportions in mind, the practitioner can weigh out the simple ingredients of the compound drug to obtain the intended strength. Al-Kindī’s solution to the gap in Galen’s pharmacology was popular not only among medieval Islamicate but also European doctors, who read it through a 12th-century Latin translation.

HEAT! A Recipes Project Thematic Series

Astronomy- the Earth and the sun during summer in the Northern hemisphere. Wellcome Collection.

As humans, we want to control heat. We want to create heat, temper or even extinguish it, depending on context and purpose. We have a very limited temperature range at which we are comfortable (some microbes and bacteria can survive temperatures as low as -20C and as high as 130C), so we spend an incredible amount of time managing heat, whether it is our body temperature or that of our homes, offices, laboratories, cars, or food.

When we started planning this series of blog posts in early May, we could not have suspected how appropriate the theme would feel by now. While much of northwestern Europe has not seen rain in weeks and is sighing under a heatwave with temperatures rising to 37C/98F, we have fled to airconditioned spaces to edit the posts. Climate-wise, heat is seasonal in these regions, but it has always played an important role in recipes year-round, all around the world, from antiquity to the present day, in fields as diverse as alchemy, chemistry, art, cooking, medicine, and personal grooming.

The common denominators of heat in all these realms are that it is either internal – emanating from the human body – or external, naturally occurring from the sun, thunder, or lava, or man-made through friction or fire. In the posts in this series, we will see a wide variety of attempts to control these different kinds of heat through recipes and instructions.

Managing natural heat: Venice turpentine is a thick paste (aka sticky mess) at room temperature, but becomes fluid around 25C, and nicely mixes into the rest of the varnish ingredients when left out in the sun. Photo: Marieke Hendriksen

Some of our authors recreate such attempts by reconstructing experiments outlined in historical art technical and chemical sources. Indra Kneepkens recounts how she discovered through reconstruction research that sometimes for a recipe to make sense, it should not only be followed to the letter, but also be read between the lines. Ruben Verwaal and Marieke Hendriksen use their experiments with two reconstructions of small chemical ovens to reflect on the role of experimental heat in the development of theories on the nature of life in the eighteenth century. Working in a similar vein but with culinary recipes, Marissa Nicosia, from Cooking the Archive, examines the problem of heat control in her recipe recreation adventures, outlining the challenges of translating cooking instructions meant for the early modern hearth to the modern gas stove.

The four elements, four qualities, four humours, four seasons, and four ages of man. Airbrush by Lois Hague, 1991. Wellcome Collection.

Other authors in the series took our invitation as an opportunity to investigate heat in medical theories across time and place. Aileen Das kicks off this series by arguing that heat occupied a central place in ancient Greek, Roman and medieval Islamicate theories about the human body and its care. Taking on the smelly problem of perspiration and body odor, Cari Casteel reminds us that this issue is as old as mankind and offers several remedies from Roman authors.  Catherine Rider, on the other hand, examines notions of heat in fertility remedies in medieval England, noting that, whilst popular, heat-based treatments (to either increase or reduce heat in the body) were not the only kind of fertility aid available to English couples. The series concludes with two posts focused on fever and disease. Fittingly in this current heatwave, Laurence Totelin offers a post on fever and dog days of summer in antiquity. Finally, writing on in Late Imperial China, Marta Hanson introduces us to ideas of fever in Chinese medicine.

We’ve had a great time editing this series – hope you enjoy reading the posts wherever you are. Happy summer and stay cool!

Marieke Hendriksen and Elaine Leong

P.s. We were so inspired by our contributors’ posts that we’ve decided to dedicate the December issue to (you guessed it) COLD!. If you’re interested in joining the conversation, send a short pitch to