Oyster omelette originated in the city of Chaozhou (Teochew) and the region of Fujian in China. It is a signature dish of the Hokkien people - Chinese diaspora in Taiwan, Malaysia, Singapore, Indonesia, and the Philippines.
The dish consists of small oysters added to a mixture of potato starch and egg batter. Depending on the region, cooks will sometimes add a dash of spicy chili sauce mixed with lime juice to intensify the taste of the whole dish. The city of Tainan in Taiwan is even unofficially called the snack city, especially because it offers one of the best oyster omelettes in the region - unsurprisingly so, because its coastal location ensures that it is never in lack of fresh oysters.