Put the eggs in boiling water and cook for about 10 minutes. Drain, rinse with cold water and remove the shell. Meanwhile clean and wash rocket salad and rocket, if necessary pluck into bite-sized pieces.
Drain well on a sieve. Mix yoghurt, mayonnaise, ketchup and lemon juice well. Fold in 300 g prawns. Season to taste with salt, pepper and sugar. Cut 1 1/2 eggs into cubes and stir into the shrimp cocktail.
Cut remaining eggs into eighths. Arrange salad leaves and egg quaver on plates, place crab salad in the middle. Sprinkle with 100 g crabs and garnish with dill sprigs.