Peel and chop the onion. Peel, wash and chop the potatoes. Heat butter in a pot. Brown the potatoes in it. Add 300 g peas, 3⁄4 l water, broth and 150 g cream. Bring to the boil and simmer covered for 15-20 minutes.
Wash the chives and cut into small rolls. Puree the soup. Simmer the rest of the peas for 2-3 minutes. Season to taste with salt and pepper. Serve soup with remaining cream and chives. It goes well with farmhouse bread.