Maillard Reaction

The set of chemical reactions between amino acids and reducing sugars that produces the brown crust, deep flavour, and characteristic aromas of seared, roasted, or grilled food.

Why it works

Above roughly 140°C, amino acids and reducing sugars in food begin bonding — not a single reaction but a cascade of hundreds, producing melanoidin pigments (the brown colour) and a vast range of new flavour compounds, including pyrazines, furans, and thiols. The reaction intensifies up to about 180°C; beyond 200°C it accelerates; above 230°C it tips into charring and bitterness. (McGee, On Food and Cooking, 2nd ed., pp. 778–779.)

Water suppresses Maillard entirely. As long as the surface of food is wet, it sits at 100°C and cannot get hot enough. This is why a wet steak won't brown properly, why you dry protein surfaces before searing, and why roasting in a dry oven browns food that boiling never would.

Maillard is distinct from caramelisation, though the two often happen together. Caramelisation is sugar breaking down on its own at high heat. Maillard needs both sugars and amino acids, and produces more complex flavours. (Modernist Cuisine, vol. 2, pp. 146–154.)

How to use it

Dry surfaces thoroughly. Pat meat with kitchen paper before searing. Let vegetables roast in a single layer so steam can escape.
Use a pan hot enough. A cold pan steams. Aim for a pan surface at 190-220°C — olive oil smokes faintly at this point.
Don't move the food for the first minute. Crust formation needs sustained contact. Lifting to check too early tears the nascent crust away.
Salt early. Dry-brined surfaces Maillard faster than wet ones (see Salt as Seasoning).
Don't overcrowd the pan. Too much food at once drops the pan's temperature and releases steam from multiple surfaces, which kills browning on all of them.

Common mistakes

Searing cold, wet meat straight from the fridge. The surface cools the pan and steams instead of browning.
Using oils with low smoke points — extra virgin olive, butter alone — for high-heat searing. Use grapeseed, refined sunflower, or rendered beef fat.
Mistaking burning for Maillard. Black, acrid crust has passed 230°C into charring territory. Deep mahogany, not black, is the target.
Assuming Maillard only applies to meat. Roasted vegetables, toasted bread, grilled onions, dark chocolate — all Maillard.

Examples

(auto-appended as the user logs cooks that touch this concept)

2026-04-27 — I seared the turbot skin-side down in a hot pan. The skin crisped fast without the flesh overcooking — the Maillard reaction happened at the surface while the interior stayed barely warm.

At the start I pressed the fish down for thirty seconds. This stopped it curling and kept the skin flat against the heat, which is what gives you the crust.

While it cooked I basted it with butter. This kept the temperature up and added flavour without making me sear it any longer than I needed to. The fish was done in a couple of minutes.

2026-05-04 — I assembled a simple breakfast sandwich with a pancake and layered crispy pancetta with maple syrup. The pancetta has been cooked until it's golden brown and slightly curled at the edges, with good colour development and a slight glaze suggesting it's been cooked through to the point of crispness. The pancake appears lightly toasted, providing a sturdy base for the generous amount of meat piled on top. It's a straightforward execution of a classic.

I made a pancake on my cast iron griddle, cooking it over moderate heat until the bottom developed a golden-brown crust with some darker spotting. The top surface shows the characteristic pale, slightly set appearance of a pancake that's been flipped or is nearing the end of cooking, with visible browning marks that suggest even heat distribution across the pan. The oil or butter on the griddle is visibly shimmering, indicating good temperature control throughout the cooking process.

2026-05-10 — I made a pancake on my cast iron griddle and got a nice golden-brown cook on the first side, with some darker spotting across the surface that suggests good heat distribution. The pancake has risen evenly and shows a pale, set top with a slightly darker, crispy-edged base – exactly what you want before the flip. There's visible oil or butter on the pan around the edges, which helped achieve this gentle caramelisation without burning.

I've made a straightforward bacon sandwich on a toasted bun. The bacon has been cooked until crisp and deeply caramelised, with the fat rendered down to a glossy amber and the edges curled and slightly charred. The meat is layered generously across the split bun, which shows good colour from toasting and has absorbed some of the bacon fat. The overall execution is clean—good heat control on the bacon without burning, and proper layering for a satisfying sandwich.

Sources

McGee, Harold. On Food and Cooking: The Science and Lore of the Kitchen, 2nd ed. Scribner, 2004. pp. 778–779.
Myhrvold, Nathan et al. Modernist Cuisine: The Art and Science of Cooking, vol. 2. Cooking Lab, 2011. pp. 146–154.