Place all the filling ingredients in a medium mixing bowl and stir vigorously until the mixture binds (approximately 3 minutes). Cover and leave to rest in the fridge for 30 minutes.
To wrap the shumai dumplings, make a circle with your thumb and index finger and place one wonton wrapper on top of the circle. Add1-2 teaspoon of filling onto the center of this wrapper, nudging gently down the circle. Squeeze into shape and pat the filling down with the back of the teaspoon. Garnish the top with some fish roe. Repeat for the remaining dumplings.
Place the dumplings into a steamer and steam for 8-10 minutes. Once cooked, serve immediately.
