Cut in slices the remains of any cold meat, such as pork, beef, veal, ham, or mutton. Melt in a pan a bit of salt butter the size of a walnut, and put in it an onion cut into fine slices; let it get brown in the hot butter. In another pan put a larger piece of butter rolled in a soup-spoonful of flour; add to it the onion and butter, and add enough water to prevent the sauce from getting very thick. Add, if you wish it, a teaspoonful of meat-extract and a pinch of salt. Have ready some mashed potatoes, but let them be very light. Place the slices of meat in a fireproof dish, pour the sauce on them, then the mashed potatoes, and put the dish in the oven, all well heated through. This is called in Belgium "un philosophe."
Attributed to Paquerette.