Boil eggs in boiling water for about 10 minutes, rinse with cold water and peel. Halve 2 eggs and let them cool down. Wash the herbs, dab dry and chop except for some tarragon for garnishing.
Peel the garlic and press it through a garlic press. Pass the yolk from the cooled egg halves through a sieve. Chop the egg white finely. Mix sour cream, yoghurt, egg yolk, mustard, garlic, oil and lemon juice.
Stir in the egg whites and herbs and season to taste with salt and pepper. If desired, stir the sauce with a few tablespoons of milk to make it thinner. Cook tortellini in boiling salted water according to package instructions.
Halve the peppers, clean, wash and cut into cubes. Pour tortellini in a sieve and rinse with cold water. Cut the sausage into slices. Cut remaining eggs into eighths. Mix all salad ingredients together.
Arrange salad in small bowls and garnish with tarragon.