In a small bowl add the blackberries, 2 Tbsp. of the juice from the Lemon and the Zest of the Lemon. Bring to simmer for 6 -7 Minutes. The mixture will coat the back of the spoon when cooked enough. Strain over a bowl to remove the seeds. Allow the mixture to cool – ¼ Cup of Puree.
In a mixing bowl add Powder Sugar, butter and cream together. Add the Whipping Cream 1 Tbsp. at a time then the vanilla and salt.
Then add the chilled blackberry Sauce. Cream together for about 5 minutes until you have the perfect creamy frosting.