Clean, wash and roughly chop the spring onions. Peel, wash and chop the potatoes. Heat the oil in a large pot. Fry spring onions and potatoes in it. Add 1 l water and stock, bring to the boil and cook for about 10 minutes.
Add frozen peas, bring to the boil again and continue cooking for about 5 minutes.
Wash the wild garlic, shake dry and chop. Finely puree the soup, stir in the wild garlic and crème fraîche. Season to taste with salt, pepper and 1 pinch of sugar.