Clean, wash and drain the lamb's lettuce well. Roast sunflower seeds in a pan without fat. Remove. Wash apples, quarter them, remove seeds and cut into slices. Drizzle apple slices with some lemon juice.
Pluck the trout fillets into smaller pieces. For the vinaigrette, peel and finely dice the shallots. Mix vinegar, honey, diced shallots, mustard and a little salt and pepper well. Finally, beat in olive oil.
Mix lamb's lettuce, apple slices, sunflower seeds and trout with the vinaigrette and arrange on a deep plate.