For extra crunch, add finely chopped water chestnuts. Make sure to squeeze as much of the water out and add to the filling mixture.
Alternative topping options: tobiko, salmon roe, salted egg yolk pieces, pork/fish floss. For seafood allergies: Replace prawns with chicken.
Siu mai freezes very well. Prepare in advance, store in freezer bag and steam when needed. No defrosting required.