Potatoes kg. 1,
ripe tomatoes (or peeled) gr. 500,
onions 2,
oregano,
olive oil,
salt and pepper.
Cut potatoes in thin round slices and put them in a tin previously greased with oil. Alternate a layer of potatoes with sliced onions, peeled and seedless tomatoes, oil, salt, pepper and a lot of oregano.
Back on a moderate flame for about an hour, until potatoes get soft.