1 For the dressing, wash and halve the tomatoes. Heat 6 tbsp oil and sweat the shallots, tomatoes and garlic. Deglaze with the white wine and stock and simmer for about 8 minutes until reduced. Add the green peppercorns and season to taste with salt.
2 Wash the salmon, pat dry and cut into large cubes. Season with salt and pepper and sauté on all sides in 2 tbsp olive oil (not too hot). Season the scallops with salt and pepper, add to the pan and fry lightly, then cover and cook for about 2 minutes. Season the shrimps, add to the pan and cook for a further 3-4 minutes. Finally add the butter and half of the dill.
3 Peel the lower third of the asparagus spears and cut off the hard ends. Blanch in boiling, salted water for about 5 minutes. Then add the mangetout and simmer for a further 5 minutes or so. Drain, refresh briefly in cold water and drain thoroughly.
4 Arrange the asparagus and mangetout on warmed plates and place the fish on top. Add the rest of the dill to the dressing and sprinkle over the fish and vegetables.