1 oz Dry Gin 1/2 oz Elderflower Liqueur 1 oz Grapefruit Juice 1/2 oz Lemon Juice 1 Large Basil Leaf.
Boxcutters, Jigger, Shaker Classic/Boston, Citrus Juicer, Strainer, Coupe Glass.
Fill a cocktail Shaker with Ice. Add all of the remaining...