DeKuyper Sour Apple Pucker Schnapps is a green apple flovored Schnapps. Sour Apple Pucker is used in the very popular martini recipes, Washington Apple and the Apple Martini. Sour Apple Pucker Schnapps is the most popular of the DeKuyper Pucker Schnapps that are available. Sour Apple Pucker is made with neutral spirits sugar and infused with green apple flavor.: