Instructions: An 18 cm deep loosebased cake tin greased and lined

Set the oven at Gas Mark 5 375 degrees F 190 degrees C. Peel and thinly slice the potatoes (this can be done in a processor).

Peel and thinly slice the onions.

Layer the potatoes and onions in the tin seasoning each layer and dotting with a little butter.

Finish with a layer of potatoes.

Melt the remaining butter (about 30 g ( 1 oz)) and brush over the potatoes.

Set the cake tin on a baking tray and bake for 1 1/2 to 2 hours or until the potatoes are tender; the cooking time will depend on the type of potatoes used.

Turn out on to a warmed plate and serve piping hot.

Serves 6

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