Definition: In this task, you have to generate the title of the recipe given its required ingredients and directions.
Input: ingredients:  '1 lb. confectioners sugar', '1/2 c. butter or margarine, softened', '1 tsp. vanilla', '3 Tbsp. milk', 'food color (optional)',<sep> directions: 'In large bowl, beat together sugar, butter, vanilla and milk until smooth.', 'If necessary, add more milk until frosting spreads smooth.', 'If desired, add a few drops of food coloring.', 'Can frost a two layer cake.'

Buttercream Frosting