This marinade mashes up flavorings from several Asian grill cultures: soy sauce and sake from Japan; sesame oil and seeds from Korea; five-spice powder and oyster sauce from China; plus jalapeños from the United States. Put them together and you get a marinade that turns poultry, meat, seafood, and even tofu into championship Asian-style barbecue. To get the full effect, use dark nutty Asian-style sesame oil, made with roasted sesame seeds. Oyster sauce is a thick briny condiment available in Asian markets and many supermarkets.