Spread the butter over the base of a
Separate the eggs and, in a bowl whisk the yolks with the remaining sugar until light and fluffy. Beat in the potato purée and continue beating for 1 minute.
In a clean bowl, whip the egg whites until they make soft peaks, then fold into the potato mixture. Pour over the cranberries and level the top.
Bake in the centre of the oven heated to
The aphrodisiac qualities of the potato (once called The Apple of Love) were believed in the nineteenth century to account for the population explosion in Ireland.
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