Guanciale

Sheep salt and pork fat emulsify into the sauce. There is no third ingredient.

Yolk lecithin binds rendered fat into a custard that never sees cream.

Coarse cracked pepper is the only acid substitute Rome allows here.

Starch water is the emulsifier; without it the fat just sits on the bowl.

Acid and glutamate turn gricia into amatriciana with one addition.

Capsaicin against fat that would otherwise sit there uncontested.

Sweet allium melted in the fat; contested in Amatrice, correct in practice.

Cynaropicrin bitterness plus cheek fat, a Roman spring pairing that predates carbonara.

Green starch and funky fat; the bean drinks it and stays grassy.

Two fats with an iodine-and-funk edge; the pasta water binds them together.