Meanwhile, mix 1 tub of sour cream and low fat sour cream with lemon juice, soya sauce, salt and pepper. Pour over salmon and bake another 5 mins.
Fry red onions, garlic, chili and white wine and steam mussels for 4 minutes. Sprinkle a handful over salmon, along with spring onions. Serve with the rest of the mussels on the side and with boiled potatoes.