Entertaining Cocktail Party Ideas Blackberry Puree 3.2 (15) Close Yield: Makes about 1/2 cup Use this recipe for blackberry puree to make a Cranberry Sparkler, a festive holiday drink. Directions Place blackberries in the bowl of a food processor; process until pureed. Strain through a fine mesh sieve set over a medium bowl; discard solids. Keep refrigerated in an airtight container until ready to use, up to 2 days.