Potatoes in Sour Sauce

• a few freshly boiled potatoes
• the peel of 1 large lemon, cut in 3 or 4 large strips

Melt the butter in a saucepan and fry the chopped onion till it begins to brown. Sprinkle with a little flour, and when this browns add the hot stock gradually, and finally the vinegar, lemon peel, bayleaf and a seasoning of salt and pepper. Simmer for ½ an hour. Add the hot boiled p