Never Fail Chocolate Frosting
["2 c. sugar", "4 Tbsp. cocoa", "1/2 tsp. vanilla", "1 stick butter"]
["Combine all ingredients except vanilla.", "Stir until sugar dissolves over medium heat.", "When mixture comes to rapid boil 1 minute.", "Add vanilla.", "Cool and beat."]
["sugar", "cocoa", "vanilla", "butter"]