ngredients for dough:

Bun:

8g instant dry yeast
160ml lukewarm water
½ tsp white vinegar or lemon juice (optional)280g low-protein flour aka hong kong flour
100g wheat starch
90g icing sugar
30g shortening or vegetable oil10g baking powder
10ml cold water

Fillings:

A
250g char siew, diced
½ tbsp cooking oil
1 tsp sugar*
1 small onion, diced
1 tbsp oyster sauce*
1 tbsp soy sauce*
1 tsp. sesame oil
1-2 drops red food colouring (optional)

B
150 ml water
1½ tbsp corn flour
Salt to taste

*Some store-bought char siew comes with sauce, use it for preparing filling. Omit sugar, oyster sauce and soy sauce.