In a shaker, combine ice, gin, lemon juice, and rosemary simple syrup. Shake until extremely cold
Pour over ice into a 12-ounce glass. Top with about 3 ounces of lemon soda water.
Notes
Keto Rosemary Simple Syrup:In a small pot, bring 1/4 cup rosemary leaves (off of stem), 1 cup of water, and 1 tablespoon of monk fruit liquid sweetener to a simmer. Allow to simmer 10-15 minutes, then take off of heat to cool for 10 minutes. Pour through a fine mesh strainer, and store strained syrup in the fridge up to one month.This recipe makes one cocktail with 1 net carb.