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Caramelization & the Maillard Reaction
The two kinds of browning, and why brown food tastes good.
Two different reactions make food brown and delicious. Caramelization is sugar breaking down under heat (onions, caramel, roasted carrots). The Maillard reaction is sugars reacting with proteins (seared steak, bread crusts, coffee) and creates hundreds of new aroma compounds.
Both need heat and, crucially, dryness — water holds the surface temperature at 100°C, below where browning begins (~140°C). That is why you dry meat before searing and why crowded pans produce pale food.
Fond — the brown crust left in the pan — is concentrated flavor. Deglaze it with wine, stock, or even water, scrape it up, and it becomes the base of the sauce.