- 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.