Slice the prawns into small cubes and mince them into a sticky paste (use a food processor if you prefer).
In a bowl, mix the minced prawns, spring onion,salt, sugar, white pepper, dashi powder, egg white, and plain flour until well combined.
Prepare the pocket shaped steamed buns by microwaving them for 40 seconds to make them softer, easier to unfold, and prevent them from sticking together.
Spread a portion of the prawn mixture inside each bun.
Coat the prawn filling with sesame seeds, or brush melted butter on the top of the bun and sprinkle sesame seeds over it. (optional)
Brush the buns with melted butter and air fry at 190°C for 8 minutes until golden and crispy.
Serve with your favourite dipping sauce. (I used burger sauce, but you can also make your own by mixing mayo and sriracha.)