Peel, wash and cut the potatoes and carrots into small pieces. Peel and chop the onion. Heat the oil in a large pot, fry the ham in it until crispy, take it out. Steam peas without soaking, vegetables, onion and bay leaf in the oil, add 1 litre of water and bring to the boil. Cover and boil down for 1 1/4-1 1/2 hours
If the soup is too thick, dilute with more water. If it's not creamy enough, blend it gently with a hand blender. Season to taste with stock, salt and pepper. Wash parsley, dab dry and chop finely. Pluck trout and ham in pieces.
Stir the crème légère until smooth. Spread the soup on plates. Serve with crème légère and either ham or trout. Sprinkle with parsley