Combine prawns, egg white, minced garlic, chopped spring onion, pepper powder, soya sauce, cornflour and salt. Blend this in a food processor till it becomes a paste (refer notes).
Cut each slice of bread into 4 triangles. Spread the paste on 1 side of the bread & try & press down as much as possible. Sprinkle on sesame seeds on top of the paste.
Heat oil in a deep and wide pan, till hot but not smoking, place your toasts (paste side down) into the oil & fry for approx 30-50 seconds each side or as desired.
Serve hot with sweet chilli sauce.