1 1⁄3 oz Rye
2⁄3 oz Underberg bitters (one bottle; or other Boonekamp bitters)
1⁄4 oz Simple syrup (1:1; or a teaspoon fine sugar)
1 twst Lemon peel (as garnish)
Stir, strain, goblet, twist.
Other brands of Boonekamp bitters are Kuemmerling and Bergwunder. They have a bittersweet, anise-y, complexly herbal flavor, and are normally imbibed quickly, from 20ml bottles.
Rye, Underberg bitters, Simple syrup, Lemon peel