Clean, wash and slice the celery. Leek onions clean, wash and cut into rings. Peel and chop the onion. Heat oil in a pot. Fry the prepared ingredients in it.
Add peas and 300 ml of water. Bring to the boil, add stock and cook covered for about 15 minutes. Wash mint, dab dry, put something aside for garnishing. Take out some vegetables with a skimmer, put aside.
Add mint to the soup and puree everything. Season to taste with salt and pepper. Add the vegetables set aside to the soup again. Serve the soup with yoghurt. Garnish with set aside mint.