Caramel Cake Frosting - cooking recipe

Ingredients

1 1/2 c. brown sugar, firmly packed
1/2 c. granulated sugar
1 c. milk
1 Tbsp. butter

Preparation

Boil sugars and milk until syrup forms a soft ball in cold water (232\u00b0).
Add butter; remove from heat.
Cool to lukewarm (110\u00b0).
Beat until thick and creamy and of right consistency to spread.
Will cover top and sides of two 9-inch layers.