Melt ¾ Cup Butter in large saucepan
Add 1 ½ Cup firmly packed brown sugar
Add ¼ Teaspoon salt

Cook over low heat 2 minutes stirring constantly. Add 1/3 Cup Milk. Continue stirring until mixture comes to a boil. Remove from heat. Blend in 3 ½ Cups powdered sugar gradually. Add ½ Teaspoon vanilla and mix well.