Pistachio Macarons with Cannoli Cream
If you don't have a pastry bag, spoon mixture into a large resealable plastic bag and snip a 1/2-inch hole in one corner of the bag.
Layer unfilled cookies between sheets of waxed paper in an airtight container; cover. Store in the refrigerator for up to 3 days or freeze for up to 3 months. Thaw cookies, if frozen. Fill as directed in Step 5.