What is the xo sauce for Che Che Noodle?

The XO sauce of Che Chai Noodle stands for Top Sauce, which is a mixture of dried scallops, ham meat, large-grained scallop, sea shrimp rice and chili peppers boiled down in several stages, XO sauce is a higher-grade homemade sauce in Cantonese cuisine.

The XO sauce is characterized by its reddish color, strong fresh taste, and mellow, slightly spicy flavor. In Sydney, Australia, local restrictions on food imports prompted local Chinese to concoct XO sauce from local ingredients, using salmon instead of scallops and shrimp.