3 c. white sugar
1 1/4 c. evaporated milk
3 tbsp. flour
1 c. butter

Melt 1/2 cup of the sugar in a heavy skillet over low heat, stirring constantly. In a heavy skillet or saucepan mix the rest of the sugar, milk, flour and butter. Cook to 225 degrees and stir while cooking, add the melted sugar as the mixture boils. When it is done, it can be put on the cooled prune cake.