Preheat the oven to 200ºC/400ºF/gas 6.
Rub the salmon pieces with a little oil, lemon juice and zest, salt and pepper. Place them on a piece of foil and bake on a baking tray in the preheated oven for 15 to 20 minutes until cooked. Remove from the oven and leave to cool slightly.
Grate the garlic into the mayonnaise and season with salt and pepper, a little lemon juice and the cayenne pepper. Dress the potatoes and green beans in a little salt and pepper, lemon juice and zest and olive oil. Toss together with the watercress and herbs and spread out on four plates. Line the four plates with the mixed lettuce leaves, peppers and carrots. Break the cooked salmon up and place on the dressed beans and potatoes. Serve with the mayonnaise.
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