Roughly mince prawns into a rough paste. Transfer to a mixing bowl
Finely grate ginger and garlic and add to prawn paste. Add sesame oil, salt, white pepper, cornflour and egg white. Add spring onion or coriander. Stir in one direction until well mixed.
Spread prawn paste over a slice of sandwich bread.
Sprinkle with sesame seeds and spread out evenly with a spoon. Now, cut bread into triangles (or squares, if you like!)
Heat up a shallow layer of oil in wok.
When wok is hot, place each triangle down carefully. You only need to fry 10-15 seconds as prawns cook very quickly, especially since the meat is already minced.
Quickly flip over and fry other side of bread for a few seconds. Again, you don't need a long time. Monitor the heat and adjust as necessary to avoid burning.
Remove from heat and serve with chilli sauce and mayo.