Cook the pasta in boiling salted water according to the instructions on the packet (approx. 9 minutes). Drain, allow to drain and cool. Cook eggs in boiling water for about 10 minutes. Drain and rinse with cold water, remove the shell. Wash the chives, dab dry and cut into rings. Put 1 tablespoon aside. Mix crème fraîche, milk, horseradish, chives, lemon peel and juice.
Season to taste with salt, pepper and sugar. Clean the rocket, wash and pat dry. Pluck or cut trout fillets into bite-sized pieces. Dice eggs. Mix noodles with sauce, carefully fold in remaining ingredients, season again. Garnish with caper apples and lemon slices. Sprinkle with remaining chives and coloured pepper