Pan-Mesoamerican — the comal predates the Aztec civilisation; clay comales found in archaeological sites dating 3,000 years
The comal (flat griddle) is the most essential piece of equipment in Mexican cooking — used for tortillas, antojitos, charring chiles and aromatics, toasting dried chiles and seeds, and finishing masa preparations. Comal management is a skill: a cold comal produces steamed, pale food; a too-hot comal burns before cooking through. Different materials (clay barro, cast iron, steel) have different heat properties. A seasoned clay comal produces a different char and flavour than cast iron. Temperature control is assessed by water drop (sizzle) and visual observation.
The comal does not have a flavour — it imparts char, smoke, and the Maillard reaction to whatever is cooked on it
{"Clay comal: heat slowly over medium heat — thermal shock cracks clay; never put a cold clay comal on high heat","Cast iron comal: heat slowly, pre-season with lard; retains heat better than clay, makes charring more aggressive","Steel comal: heats quickly, cools quickly — requires more active heat management than cast iron","The dry water drop test: a drop of water should sizzle and evaporate in 2 seconds on a correctly heated comal","For tortillas: medium heat; for charring chiles: medium-high; for toasting seeds: medium with constant movement"}
{"Season a new cast iron comal: heat with lard until smoking, wipe out excess, repeat 3 times — builds a non-stick layer","For clay comal first use: rub with onion and oil before first heating — conditions the clay surface","The ideal working kitchen has two comales: one for tortillas (medium) and one for charring (high) — different temperature zones","When charring chiles on a gas burner without a comal, use a mesh screen — more even char than direct flame"}
{"High heat from cold start — uneven heating and hot spots that burn","Washing a seasoned comal with soap — destroys the seasoning layer; rinse only","Using a wet comal — water on a hot comal causes dangerous splattering","Forgetting that clay cools faster than cast iron — clay requires more frequent heat adjustment"}
The Art of Mexican Cooking — Diana Kennedy; Tacos: Recipes and Provocations — Alex Stupak