Fresh Berry Frosting
1 cup butter softened
6 cups powdered sugar, sift for lump-free frosting
½ cup strained berry puree (about 1 ½ cups fresh organic blackberries or raspberries)
1 tsp vanilla extract
1-2 Tb lemon juice, optional
Using a blender or food processor, thoroughly puree the blackberries adding 1-2 Tb lemon juice if desired. Strain the pureed blackberries through fine strainer/sieve to remove the seeds. Discard seeds. You will use ½ cup of this puree.
In a mixing bowl, beat butter on medium speed until fluffy, about 2 minutes.
Slowly add 1 cup powdered sugar and beat until smooth.
Add blackberry puree and pure vanilla extract and beat.
Gradually add in the remaining powdered sugar, beating on low speed until combined. Then beat on medium high until light and fluffy, about 3 minutes.