Case Study 2 — The Discovery of Aquafaba

A historical case study with documented sources. Ends with an analyze-this prompt.

In late 2014, in a kitchen in northern France, a chef named Joël Roessel was experimenting with the leftover liquid from a can of chickpeas. He was a vegan cook in a country where vegan cooking was still a small movement, and he was working on the problem of replacing egg white in classical pastry preparations.

The leftover liquid was, until that moment, kitchen waste. You drained it into the sink. It was thick, viscous, slightly cloudy, with a faintly beany smell. You did not eat it. You did not cook with it. You poured it down the drain and used the chickpeas.

Roessel poured it into a bowl and started whipping it. He was not the first to wonder if a plant-derived liquid might foam — vegan cooking communities had been searching for egg-white replacements for decades, with limited success. But what he saw when he whipped chickpea liquid in 2014 was unmistakable: a stable, glossy white foam that held peaks. He could fold it into a chocolate mousse. He could pipe it. It behaved, structurally and functionally, almost identically to whipped egg white.

He posted his findings on his blog and on French-language vegan cooking forums. The technique spread modestly through the French and broader European vegan-cooking community.

Across the Atlantic, in Anderson, Indiana, a software engineer named Goose Wohlt was working on the same problem, independently. Wohlt was a hobbyist cook, vegan since 2014, with no formal culinary training but a software engineer's love of solving problems with reproducible methods. He, too, had been trying to replace egg whites in vegan baking — meringue, macarons, soufflé — and he, too, had encountered the chickpea liquid.

In March 2015, Wohlt posted in a vegan Facebook group called What Fat Vegans Eat. His post described his successful tests using chickpea liquid as an egg-white substitute in meringue. He named it aquafaba — Latin for "bean water" — because, as he put it, "vegan meringue from canned chickpea liquid" was a mouthful of words that would never catch on as a recipe term. Aquafaba would.

The Facebook post went viral within the vegan cooking community. By April, vegan bloggers around the world were testing aquafaba meringues, macarons, mayonnaise, marshmallow, royal icing. By summer, mainstream food media had picked up the story. By 2016, aquafaba had entered the food-science vocabulary, with researchers at universities running characterizations of its protein content, its foaming kinetics, and its application range.

The compound chemistry, once researchers turned their attention to it, was straightforward enough. Chickpea cooking liquid contains:

• Proteins (~1%) — primarily small albumins and globulins leached from the chickpea during cooking. Two of the most relevant are 2S albumins (small storage proteins) and 7S globulins. They denature at the air-water interface during whipping, similarly to egg-white ovalbumin.
• Saponins (~0.5%) — natural surfactants that lower surface tension and stabilize the foam. The same compounds that produce the bean-cooking foam.
• Polysaccharides including some leached starch and oligosaccharides — adding viscosity, slowing drainage from the foam.
• Water (~95%).

Egg white, by comparison, is about 87% water and 11% protein. Aquafaba's much lower protein content means it requires longer whipping (5–10 minutes typically, vs. 3–5 for egg white) and tends to produce slightly less stable peaks. But within those limits, it works in a remarkable range of applications:

• Vegan meringue — pavlova, baked meringue, Italian meringue.
• Vegan macarons.
• Vegan mayonnaise (oil-in-water emulsion stabilized by aquafaba proteins).
• Vegan marshmallow.
• Royal icing (with confectioners' sugar).
• Cocktail foams (gin sour, whiskey sour without egg).
• Mousses, fudges, and many other applications.

Limitations: it does not match egg white's coagulation behavior in custards, sauces, or hollandaise. It does not work in soufflé bases that depend on egg's protein-coagulation structure. It is less stable in extended-bake meringues than egg white. Pasteurization is unnecessary — aquafaba has no salmonella risk, since it has been fully cooked.

The story is interesting because…

Several aspects of the aquafaba story are worth dwelling on, beyond the food chemistry.

The discovery was missed by professional food science. Chickpea cooking liquid had been produced in vast quantities, every day, in restaurants and homes around the world, for thousands of years. Tahini- and hummus-making operations had been pouring it down the drain at scale for decades. Food scientists had studied chickpeas in detail — their protein composition, their starch behavior, their cooking kinetics — but no one had run the simple experiment of whipping the cooking liquid and seeing what happened. Until 2014, no one had published a paper on it. The discovery did not require advanced equipment; it required attention.

It was made by hobbyists, in a community. Roessel was a working chef, but he was not a researcher. Wohlt was a software engineer with no food-science training. The technique spread through Facebook groups and blogs before any university or industrial lab was involved. The formal scientific characterization came later, after the practical technique was well-established. This is the inverse of the usual flow of food-science knowledge.

It changed an industry. Within five years of Wohlt's post, "aquafaba" was a labeled ingredient in commercial vegan products, on supermarket shelves, in restaurant menus. Egg-substitute brands began to sell concentrated aquafaba in cartons. Chickpea-canning factories began to capture and sell their cooking liquid as a product, which had previously been waste. A discovery in a Facebook group became, within a half-decade, a real piece of food infrastructure.

It validates a particular kind of curiosity. Wohlt was not a credentialed expert. He was a hobbyist with a problem (he wanted vegan meringue), a willingness to try things, and a community to share results with. The discovery did not require a Ph.D. in food chemistry. It required noticing.

Why food science missed it

The standard answer for why aquafaba's foaming was missed is some combination of:

1. Plant-protein research had focused on different problems. Soy, pea, and chickpea proteins had been studied for their nutritional profiles and gelation behavior, not their foaming. The relevant proteins (2S albumins) are sometimes considered "minor" components compared to the bulk storage globulins, and minor components are often understudied.

2. Cooking-water studies emphasized waste. Research on chickpea processing waste tended to focus on what could be done with chickpea cooking water at industrial scale — mostly attempts to extract or recover nutritional components. Foaming applications were not the question being asked.

3. The vegan cooking problem wasn't a research priority. Funding agencies and food scientists were focused on broader nutritional and process questions. "How do vegans make meringue without eggs" was a niche concern that did not attract systematic research.

4. The foam looks too easy. When you whip chickpea liquid, the foam forms within minutes. It does not require special equipment, exotic ingredients, or precise conditions. The very simplicity of the result may have made it seem like something that would have been noticed if it were real — and the absence of prior reports may have been taken as evidence that it wasn't worth investigating.

The consensus is that aquafaba's properties were genuinely novel within the formal scientific literature, but were trivially observable to anyone who happened to whip a bowl of chickpea liquid and pay attention to what happened.

The wider lesson

The aquafaba story is sometimes told as a David-and-Goliath narrative — humble vegan hobbyist beats million-dollar food labs. That framing isn't quite right. Industrial food scientists in 2014 were doing important and useful work; they simply weren't asking this particular question. The labs that have since characterized aquafaba have done excellent and necessary work that Roessel and Wohlt could not have done — quantifying the protein composition, mapping the foaming kinetics, establishing reproducibility standards.

The right framing is that knowledge can flow in both directions between professional and amateur communities. Food science benefits from amateur curiosity (which sees through the conventional categories of professional research) just as amateur cooking benefits from professional rigor (which establishes what is real and what is illusion). When the two communities communicate, both gain.

For our purposes in this textbook, aquafaba is theme #4 in modern dress: cooking traditions are accumulated scientific knowledge. In this case the tradition was not centuries-old. It was created in 2014 and crystallized in 2015 — but it is a real cooking tradition now, and the knowledge encoded in it predates its formal scientific characterization. The cooks knew before the scientists did.

This is the same pattern as bread fermentation, soy-protein coagulation, hard-water bean problems, and a hundred other traditional practices we have met or will meet in this book. The order is consistent: cooks notice, cooks adapt, cooks share, science follows. Each step matters. The science follow-up is what tells us why — and the why is what lets the knowledge transfer to new applications.

Analyze this

1. The timing. Why do you think aquafaba was discovered in 2014–2015, specifically, rather than centuries earlier? What changed about the world that made the discovery happen now? Consider both technical factors (the chickpea-canning industry, the prevalence of food blogs) and social factors (the rise of veganism, online cooking communities).

2. Other "missed" discoveries. Aquafaba had been hiding in plain sight for thousands of years. Are there other foods or cooking liquids that might have undiscovered functional properties? Pick one — bean cooking water from non-chickpea legumes, the leftover whey from yogurt straining, the soaking water from soaked nuts, the brine from a jar of olives — and propose a simple experimental test you would run to characterize whether it has a useful, undiscovered property.

3. The role of community. Wohlt's Facebook post in What Fat Vegans Eat spread the technique within months. Without that community, would the discovery have gone the same way? What does this suggest about the relationship between scientific discovery and the social infrastructure through which knowledge spreads?

4. The food chemist's perspective. You are a food chemistry researcher in 2013. A graduate student proposes to you that they want to study the foaming properties of legume cooking liquids as their dissertation topic. What is your first reaction? What questions would you ask? Would you advise them to pursue it? In retrospect, what would you wish you had said?

5. From discovery to standard. Aquafaba is now a standard ingredient. How would you write a definition for "aquafaba" that distinguishes good aquafaba from bad? Consider variables like protein concentration, viscosity, age, salt content, and the original chickpea variety. What standardizations would the food industry need to make aquafaba a reliable industrial ingredient?