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From About.com's Southern Cuisine Guide:
1 1/2 cups brown sugar, packed
4 tablespoons flour
1 cup boiling water
2 tablespoons butter
2 tablespoons cream
vanilla, to taste
Mix sugar with flour in saucepan; blend well. Add water and salt. Stir while cooking for 6 to 8 minutes. If too thick add a little more water. Remove from heat; stir in butter, cream, and vanilla to taste.