Peel the tomatoes, remove the thin and dice the meat. Mix the balsamic vinegar with salt, pepper, sugar and 2 tablespoons of olive oil. Mix in the tomato pieces.
Heat two tablespoons of olive oil in a pan. Cut the fish into four equal parts and fry for 2-3 minutes on each side.
Halve, stone and slice the avocado. Serve the salmon fillets and avocado slices drizzled with the tomato vinaigrette. Serve garnished with olives and basil leaves.