Bring a pan of water to the boil and add plenty of salt. Cook the prawns for two minutes and refresh in iced water. Peel and place on a plate.
Peel and dice the mango, place in a bowl, add the red onion, chili, ginger, lime juice and coriander.
Insert the prawns onto the end of a fork (one for each prawn). Spoon a little mango salsa onto each fork and serve.