Finely chop the prawn meat until fine and sticky. Place into a bowl with the ginger, garlic, sesame oil, pepper, soy and caster sugar. Mix until a sticky paste forms.
Spread the prawn mixture on to half of the tacos. Fold over to form a half moon. Heat oil in a large pan over a medium heat. Fry on each side for about 1 minute or until crisp and golden.
Sprinkle with sesame seeds and serve with sweet chilli sauce to dip in.