Fresh or frozen blueberries,[2] and sometimes wild blueberries are used.[3] The sauce is prepared by mixing the ingredients using a food processor or blender and then heating them until the sauce reduces and thickens.[4][5][6] It may be prepared to have a smooth or chunky texture.[7] Straining the sauce using a sieve to remove particulate matter creates a smooth texture.[6] It can be preserved by freezing for later use.[8]