Place the prawns, garlic, ginger, soy sauce and egg white in a food processor, or use a stick blender, to blitz into a smooth paste. Stir in the spring onions.
Place half of the sesame oil in a large non-stick frying pan, spread around evenly using a piece of kitchen paper, and place over a medium heat. When the pan is hot, add one tortilla wrap and fry for 1-2 minutes until lightly golden on the underside.
Using the back of a dessert spoon, spread half of the prawn paste evenly over the top of the tortilla wrap, leaving a 1cm gap around the edge. Sprinkle over half of the sesame seeds and press down lightly.
Turn the tortilla wrap over using a fish slice and cook for 2-3 minutes, or until the prawn paste is cooked, pink and slightly puffy.
Remove the prawn tortilla from the pan using a fish slice and cut into eight triangles. Repeat this process to cook the second prawn tortilla, drizzle the triangles with sweet chilli sauce and serve immediately.