From the blog March 20, 2013 Nathan

The Maillard Reaction

One of the most important flavor-producing reactions in cooking is the Maillard reaction. It is sometimes called the “browning reaction” in discussions of cooking, but that description is incomplete at best. Cooked meats, seafood, and other protein-laden foods that undergo the Maillard reaction do turn brown, but there are other reactions that also cause browning. The Maillard reaction creates brown pigments in cooked meat in a very specific way: by rearranging amino acids and certain simple sugars, which then arrange themselves in rings and collections of rings that reflect light in such a way as to give the meat a brown color.

The important thing about the Maillard reaction isn’t the color, it’s the flavors and aromas. Indeed, 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 occurs in cooking of almost all kinds of foods, although the simple sugars and amino acids present produce distinctly different aromas. This is why baking bread doesn’t smell like roasting meat or frying fish, even though all these foods depend on Maillard reactions for flavor. The Maillard reaction, or its absence, distinguishes the flavors of boiled, poached, or steamed foods from the flavors of the same foods that have been grilled, roasted, or otherwise cooked at temperatures high enough to dehydrate the surface rapidly — in other words, at temperatures above the boiling point of water. These two factors, dryness and temperature, are the key controls for the rate of the Maillard reaction.

High-temperature cooking speeds up the Maillard reaction because heat both increases the rate of chemical reactions and accelerates the evaporation of water. As the food dries, the concentration of reactant compounds increases and the temperature climbs more rapidly.

caramelized carrots 4

Temperatures need to be high to bring about the Maillard reaction, but as long as the food is very wet, its temperature won’t climb above the boiling point of water. At atmospheric pressure, only high-heat cooking techniques can dry out the food enough to raise the temperature sufficiently. It’s not the water that stops the reaction, but rather the low boiling point at normal, sea-level pressure. In the sealed environment of a pressure cooker, the Maillard reaction can, and does, occur. This is something we exploit when making soups, like in our Caramelized Carrot Soup, or purees, like the broccoli puree in our Brassicas recipe. Adding baking soda to the pressure cooker raises the food’s pH (making it more alkaline), which also helps. Chinese cooks often marinate meat or seafood in mixtures containing egg white or baking soda just before stir-frying.

So, in boiled, poached, and steamed muscle foods, an entirely different set of aromas dominates the flavor. Drying and browning the surface first will, however, 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. Searing food before vacuum sealing and cooking sous vide can add depth to the flavor of sous vide dishes. This step should be avoided for lamb, other meats from grass-fed animals, and a few other foods in which presearing 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.


One of the challenges to getting the Maillard reaction going is getting the surface hot and dry enough without overcooking the underlying flesh, or at least overcooking it as little as possible. Cooks have developed several strategies to this end, some simple and some fairly baroque.

One strategy that works well is to remove as much water from the surface of the meat as possible before cooking it (via blotting or drying at low temperature). Fast heating using deep fryers, super-hot griddles and grills, and even blowtorches are also helpful tactics, such as when we deep-fry chicken wings.

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 set of reactions occur: 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.

Adapted from Modernist Cuisine


  1. GrooTheWanderer April 10, 2013 Reply

    For more on pH and the maillard reaction: The Kitchen as Laboratory by Cesar Vega et al. Chapter 13

    For a practical example: Simply slice an onion and divide between two pans. In addition to your oil or butter, add a pinch of banking soda to one pan.

  2. Rachel October 28, 2013 Reply

    Great post! Thanks for putting in simple terms as to what the Maillard Reaction is- you’re really helping a Food Science major out 🙂

  3. zool November 10, 2013 Reply

    great post, but way too many typos

  4. Bob Moss November 23, 2013 Reply

    Not exactly typos – look closely. At each place where the author intended to put a dash for punctuation there isn’t one – there isn’t even a space. This is probably some sort of font incompatibility. Other than those instances, there isn’t a single misspelled word or grammatical error.

  5. Tim January 9, 2014 Reply

    Could you please explain why you say this…

    “This step should be avoided for lamb, other meats from grass-fed animals, and a few other foods in which presearing can trigger unwanted reactions that cause off-flavors and warmed-over flavors to form when the food is later cooked sous vide.”



    • Robert August 20, 2016 Reply

      We generally don’t recommend presearing lamb. The searing step destabilizes fatty-acids in the cell membranes of the muscle tissue in lamb, which can trigger a cascade of aroma-creating reactions that can lead to a mutton-like aroma during cooking, which is only great if you like mutton.

  6. crissy July 7, 2015 Reply

    Its a culinary article not an English essay lol

    great article btw , im studying culinary arts & i didn’t know there was an actual term for the browning or carmelizing process so thanx

    • kyle thomas June 9, 2017 Reply

      Caramelization is an alternative kind of nonenzymatic browning. says “the reaction is a form of non-enzymatic browning which typically proceeds rapidly from around 140 to 165 °C (280 to 330 °F). At higher temperatures, caramelization and subsequently pyrolysis become more pronounced.”

  7. Cindy August 8, 2015 Reply

    nice articles, but i don’t like Caramelized Carrot Soup.

  8. Linda August 22, 2015 Reply

    Looking very delicious, thank your post

  9. David Skender October 29, 2015 Reply

    I have found your explanation about the browning process to be excitingly interesting ( very informative ). We have developed and patented our oven.In trying to get this unit to the marketplace I believe now that with this newfound explanation about the Maillard reaction you have made me realize that our hi-temp oven can be marketed like no other. Thank you, Dave Skender

  10. David November 19, 2015 Reply

    Great post!
    Thanks for sharing this information.
    it’s very helpful to me.

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    Thanks for that!

  12. Victoria@Mellow Kitchen February 25, 2016 Reply

    great post, i’m a big fan of your blog, thanks your post

  13. Monika September 6, 2016 Reply

    The maillard was creating any presentation to your different point and so these are very attractive blog.

  14. Linda October 11, 2016 Reply

    Wow… great post. Thanks for sharing.

  15. Food dehydrators October 19, 2016 Reply

    Firing makes food tasty… I love food with different twists. Love it.

  16. Conor @ Oven Clean Team November 11, 2016 Reply

    Good searing intro, I liked it. Thank you.

  17. Steve January 27, 2017 Reply

    With due respect, meat without additions, does not appear to contain sufficient accessible sugars or glycogen to attribute meat browning primarily to Maillard reactions. This appears to be an oft repeated fable without much supporting evidence. I expect we are seeing fat+amino reactions rather than sugar+amino Maillard reactions, but that’s a guess.

  18. Mark April 4, 2017 Reply

    nice articles, but i don’t like Caramelized Carrot Soup. 🙂

  19. Victor May 3, 2017 Reply

    What are your sources for the information on Maillard Reaction

  20. chalata June 29, 2017 Reply

    Thank you for breaking down this scientific term for us novice. The most important thing is the understanding and not the amount of typos on the article.

  21. food dehydrator reviews June 29, 2017 Reply

    For those who don’t know, The Maillard reaction is a chemical reaction between an amino acid and a reducing sugar, usually requiring the addition of heat. Like caramelization, it is a form of non-enzymatic browning. It’s somehow similar to the effect you get when you sear food with a cooking torch after sous viding.

    Thank you Nathan for breaking down some myths in your intro. Love the information you put out on this blog

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