The Maillard reaction is often mistakenly described as just “browning”, but it’s so much more than that. This complex series of chemical reactions between amino acids and simple sugars is responsible for the deep, meaty, roasted, nutty, or toasty flavors that define so many cooked foods. Truly, it should be called “the flavor reaction,” not the “browning reaction.”
The molecules it produces provide the potent aromas responsible for the characteristic smells of roasting, baking, and frying. What begins as a simple reaction between amino acids and sugars quickly becomes very complicated: the molecules produced keep reacting in ever more complex ways that generate literally hundreds of various molecules. Most of these new molecules are produced in incredibly minute quantities, but that doesn’t mean they’re unimportant.
The Maillard reaction needs dryness and heat—specifically, temperatures above the boiling point of water—to really take off. That’s why boiling or steaming doesn’t brown food. And it’s also why most recipes start with a good sear or call for reducing moisture before browning.
That being said, it actually is possible to create the Maillard reaction in soup by using a pressure cooker and baking soda.
Unlocking the Maillard Reaction in Pressure-Cooked Soups
You might not expect the Maillard reaction to show up in something as wet as a soup. After all, how can anything brown when it’s surrounded by liquid?
The pressure cooker operates at a higher pressure than normal atmospheric conditions because it can raise the boiling point of water significantly—allowing the contents to get hotter and stay hot. At these higher temperatures, Maillard reactions can occur, even in a moist environment. The result is deeply complex flavors in a fraction of the time.
Take French onion soup. Traditionally, it requires hours of slow caramelization to properly brown onions without burning them. But under pressure, you can get similar browning and Maillard flavor in just 20 minutes. A small addition of baking soda can further enhance these reactions by increasing the pH, making the environment more alkaline—another key factor that boosts Maillard activity.
The same principle applies to soups like Caramelized Carrot Soup and brassica purees. Not only does the pressure cooker soften vegetables, but it also transforms their flavor. You’ll have to try it yourself to know what we mean.
The Maillard Reaction and Blowtorches
Blowtorches generate ultrahigh temperatures—up to 1900 °C / 3400 °F—and rely on convective heat transfer from fast-moving gases to sear food at lightning speed.
Unlike broilers or grills, which primarily use radiant heat, blowtorches heat by blasting food with hot gases. The key effect includes heat and speed: the combination of searing-hot air and strong airflow evaporates surface moisture instantly, creating the dry, high-heat environment the Maillard reaction loves.
That means you can sear food quickly without overcooking the inside—a crucial advantage when finishing sous vide proteins or adding color to hard-to-reach areas, like under a chicken leg or between a roast’s crevices.
PRO TIP: Always light your torch before pointing it at food. Unburned fuel can squirt out at ignition and leave an unpleasant taste. And opt for a clean-burning fuel like MAPP gas for the best flavor.
Strategies to Remember
To get the most flavor out of your ingredients, remember these Maillard-maximizing techniques:
- Remove as much water from the surface of the meat as possible before cooking it (via blotting or drying at low temperature).
- Dry and brown the surface of your food before searing. This will allow the reaction to proceed slowly at temperatures below the boiling point of water. This is why we sear frozen steak before cooking it in a low-temperature oven.
- We also recommend searing before or after sous vide, depending on the protein. Searing food before vacuum sealing and cooking sous vide can add depth to the flavor. This step should be avoided for lamb, other meats from grass-fed animals, and a few other foods in which pre-searing can trigger unwanted reactions that cause off-flavors and warmed-over flavors to form when the food is later cooked sous vide. We recommend searing those foods after cooking them sous vide.
- Raise the pH with a touch of baking soda when appropriate (especially in soups and purees).
- Use fast, high-heat methods—like blowtorching, deep-frying, or hot grilling—for rapid surface browning.
- You might think that raising the temperature even higher would enhance the Maillard reaction. It does up to a point, but above 180 °C / 355 °F a different kind of reaction occurs: pyrolysis, also known as burning. People typically like foods a little charred, but with too much pyrolysis comes bitterness. The black compounds that pyrolysis creates also may be carcinogenic, so go easy on charring your foods for visual appeal.
Whether you’re using the standard grill, the pressure cooker, the blowtorch, or some other tool, understanding the science of heat and flavor can transform your cooking. The Maillard reaction, especially, is a culinary superpower—one that adds depth, aroma, and deliciousness to every bite.
FURTHER READING
- Modernist Cuisine at Home
- The Maillard Reaction
- All About Pressure-Caramelized Soups
- Caramelized Carrot Soup—No Centrifuge Necessary!
- Cooking Under Pressure: Pressure-Caramelized Sweet Potato Soup
- Pressure-Cooked Vegetable Soups—Modernist Cuisine at Home, p. 177 / Modernist Cuisine Vol. 2:424–427
- Cooking Steak—Modernist Cuisine at Home, p. 192