Place the bread in a bowl, cover with water, soak for about 10 seconds, then squeeze out the excess water.
Place the drained bread in a food processor with the prawns, chilli, ginger, garlic, coriander, salt and egg. Pulse until well blended.
Pre-heat the oven to 200C/400F/Gas 6.
Using lightly floured hands divide the mixture into 12 small cakes.
Spray the oil very lightly onto a baking sheet and arrange the prawn cakes on the baking sheet, evenly spaced apart.
Spray with a little oil and bake for 15-20 minutes, turning half-way through, until brown and just beginning to crisp.
Serve warm with baby lettuce, rocket or watercress leaves and a bowl of sweet chilli sauce.
