Combine all, add ice, shake and double strain into a coupe.
Top with Grapefruit Elderflower Foam.
Grapefruit Elderflower Foam recipe - 1 oz Fresh Grapefruit Juice, 1 oz Fresh Lime Juice, 3 oz Elderflower Liqueur, 6 oz Egg Whites. Instructions - Mix together juices and elderflower, add with egg whites to a whip cream canister. Seal, shake to combine and add 1 co2 charge. Makes enough foam for several drinks.