2 cups brown sugar
1 (14 oz) can sweetened condensed milk
1/2 cup margarine or butter
1 teaspoon vanilla
1/2 cup single cream, more as needed


Stir sugar and condensed milk together; heat over low to medium heat, stirring constantly, till sugar dissolves; remove from heat. Add butter and vanilla and stir well. Add cream and stir well. Store in the refrigerator. 

This is sooooo good, but don't eat too much. Or, then again.....