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Cook the leeks: Put the leeks into a large microwave dish and sprinkle over 2 tablespoons water. Cover the dish with cling film and pierce a couple of times with a fork. Cook on 850W for 3 minutes, then leave to stand for 1 minute.
Make the sauce: Whisk the olive oil, mustard, honey and lemon juice together and season with a little salt and pepper. Scatter the tomatoes on top of the leeks and spoon over half the sauce.
Cook the salmon: Lay the salmon fillets side by side on top of the vegetables and spoon the remaining sauce over them. Replace the cling film and continue cooking on 850W for 9 minutes. Leave to stand for a couple of minutes before serving.