Boil the water and add the soya sauce, ginger, finely grated peel from a ½ lime and crushed lemongrass. Leave to simmer for 10 minutes. Let the mixture cool and add the juice from 1 lime to taste.
Peel and cut the mango, cucumber, papaya and pineapple into cubes and mix together in a bowl, adding the juice from ½ lime and finely chopped coriander.
Put a frying pan on high heat with a little oil and fry the salmon for approx 30 seconds on both sides.
