It's common to find vendors frying up oyster-filled omelettes in the late-night market in Taiwan. This traditional food typically includes Chinese cabbage, sprouts, and sweet and sour sauce. Using this omelette flour allows you to make a delicious homemade Taiwanese oyster omelette. Mix the powder with a few tablespoons of water, and it's ready to use. Make a vegetarian-friendly version by swapping oysters for oyster mushrooms.