Chinese people like their food spicy. Chili sauce is a condiment that can be used to add a little heat to anything: seafood, noodles, or stir-fry dishes. It is usually made from ground chiles, vinegar, sugar, and salt. We like Tuong Ot brand sriracha sauce (the clear bottle with the bright green lid and a picture of a rooster on the label), but any Asian chili sauce or Asian hot sauce will do.