XO sauce is a spicy seafood sauce that originated from Hong Kong.
It is made of chopped dried seafood, including scallops, dried fish and shrimp, and subsequently cooked with chili peppers, onions, and garlic
XO sauce can be used as a condiment on the side of main dishes or used in cooking to enhance the flavor of fish, meats, vegetables, and otherwise blend foods such as tofu or noodles. Home cooks often use this sauce as the chief flavoring for fried rice and chow mein
Source: Kei Cheong (Canada) Inc.