Vegetarian Oyster Omelette

Ingredients: Plain Flour – 50g
Sweet Potato Flour – 70g
Rice Flour – 90g
Water – 500ml
Eggs – 3+
Mushrooms
Chopped Coriander
Light Soy Sauce – 3 tbsp
Vinegar – 1/2 tbsp
Sesame Oil – 1/2 tsp