1 1/2 cups butter
1 (13 oz.) can Pet milk
1 lb. brown sugar
2 cups granulated sugar
1/8 tsp. salt
1 lb. confectioners' sugar
1 tsp. vanilla

Combine butter with milk, brown sugar and granulated sugar in a 6 quart heavy saucepan; heat over medium heat. Add salt and bring to a boil. Keep gentle boil and constantly stir to avoid scorching until you reach the softball stage 234-240°F (when small amount dropped from spoon in cold water forms a soft ball). Remove from heat.

Cool 20 minutes, then beat in confectioners' sugar and vanilla with an electric mixer; beat until thick. Spread in 2 buttered 9 inch loaf pans. Chill several hours.