In a medium bowl, whisk coconut milk with peanut butter, curry paste, lime juice, fish sauce and sugar. Then stir in coriander.
For best flavour, before marinating make shallow slashes in chicken, shrimp, pork or beef. Just before barbecuing remove meat from marinade, shake off excess. Sprinkle with salt and grill. For seafood, marinate up to 30 minutes. For meats marinate 2 hours, preferably overnight.