This bright and refreshing gin cocktail is made with ruby red grapefruit juice and rosemary simple syrup. Festive enough for special occasions but easy enough for a casual date night at home.
Begin making the rosemary simple syrup by heating the sugar and water in a small sauce pot over medium high heat. Bring to a boil then remove from the heat. Whisk until the sugar is completely dissolved. Add the rosemary sprigs then let steep until cool, at least 2 hours or up to three days. Strain the rosemary sprigs before using.
To create a salt rim for the glasses, place about 1/2 cup of coarse Kosher salt on a plate. Run a lime wedge around the rim of four cocktail glasses then gently run the glass rim around the salt to coat; set aside.
In a large pitcher, mix together the gin, grapefruit juice, lime juice, and rosemary simple syrup. Stir well.
Fill each glass with ice then pour the gin and juice mixture 2/3 way full. Top each glass with club soda and garnish with lime wedge or rosemary sprig to serve.
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Notes
If you don't plan to use the rosemary simple right away, store in an air tight refrigerated container for up to 7 days.