Boil the egg hard for about 10 minutes, drain, quench and peel. Peel and finely chop the onion. Melt the fat. Sauté onion in it. Add peas, deglaze with broth, bring to the boil and simmer for 5 minutes.
Wash herbs, dab dry. Pluck the mint leaves from the stalks, except for something to garnish. Chop mint and parsley finely. Puree the soup, season to taste with salt and pepper and add the chopped herbs, except for 1 tablespoon, to the soup. Finely dice the egg. Arrange soup in bowls. Stir yoghurt until smooth. Add 1 tablespoon of yoghurt to each soup. Sprinkle with egg and remaining herbs.
Finely dice the egg. Arrange soup in bowls. Stir yoghurt until smooth. Add 1 tablespoon of yoghurt to each soup. Sprinkle with egg and remaining herbs. Garnish with mint