Preheat the oven to 300F. Line and butter a 10-inch round cake pan. In a mixing bowl combine the flour and ground almonds. Make a hole in the middle and add 3 of the egg yolks, sugar, rum, pinch of salt and the butter. Knead with your fingers until the mixture forms a ball. Roll out the dough to a thickness of 3/4 inch and line the cake pan. Brush the surface with the remaining egg yolk. With a fork make a diamond pattern all over the surface. Bake for 30 minutes.
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1 1/2 cups flour
1 cup ground almonds
2/3 cup sugar
1/2 cup unsalted butter, softened
4 egg yolks
3 tbsp rum
pinch of salt
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This cake can be served warm or cold. It is perfect with tea or coffee.
