I used to work in a restaurant where we had salmon and prawns dish!! Pan cook the red onion in balsamic vineger, ground ginger and sugar(obv we would substitute with sweetner) till they go all kinda caremelised, make mash potato, grill or oven cook your salmon and prawns, put a dollop of mashed potato on the plate, sit your fish and prawns on top of the mash, your caremelised red onion on top of the fish and drizzle with sweet chilli sauce!! It is really simple to make and so delicious!! I make it alot and call it salmon oriental!! My son loves it to!!! Xx