Chilling: Do not skip freezing the piped cookies. It keeps the ridges sharp.Almond version: Replace 1/2 cup (60 g) of the flour with 1/2 cup (50 g) almond flour and add 1/4 tsp almond extract.Storage: Airtight tin at room temperature up to 2 weeks; freeze baked cookies up to 3 months.Make ahead: Freeze piped unbaked cookies, then bag them. Bake from frozen, adding 1 to 2 minutes.Nutrition is an estimate per cookie.