Finely dice the onion. Peel the potatoes and cut them into large cubes. Heat the olive oil in a saucepan and roast the onions. Add the potatoes and roast them. Stir several times. Dust with flour after a few minutes. Bring the vegetable soup to the boil and cook for about 1/2 hour. Pour into the blender and puree finely.
Serve with white or black bread croutons and a dash of pumpkin seed oil.
Fried scampi go very well with it (then with chili instead of pumpkin seed oil).