1/2 cup butter, softened
1/2 cup fresh blackberries
1 teaspoon vanilla extract
1 teaspoon lemon zest
1/8 teaspoon salt
1 (16-oz.) package plus 1 cup powdered sugar
How to Make It
Beat first 5 ingredients at medium speed with an electric mixer until creamy.
Gradually add powdered sugar, beating at low speed until blended and smooth after each addition.
Note: Be sure to wash and thoroughly dry blackberries before adding to frosting.