Macarons taste their best at room temperature or slightly chilled—the buttercream is soft, the ganache is creamy, and the shells are nice and chewy! To preserve macaron tower, cover tower tightly in plastic wrap and store in the fridge for up to 4 days. Alternatively, remove macarons from tower, transfer to an airtight container and store in the fridge for up to 4 days. Remove from the fridge half an hour before serving.