Poc chuc is a Mayan dish from the tropical southern part of Mexico that uses the unique sour oranges that grow in the region to make a tangy, fragrant marinade and salsa for grilled meat. You can use a mix of orange and lime to get the same effect, and the fresh, zingy and spicy flavour is fabulous at a barbeque - it really makes a delicious change from all those bog standard sweet and sticky marinades!