To make a Nigel:
1/2 oz lime juice
1 oz Grapefruit juice
1/2 oz 2:1 simple syrup (3/4 oz if using 1:1)
1 1/2 oz vodka or gin
2 dashes Cardamom bitters
Top with Ginger Beer
Combine juices, syrup, bitters and spirit in a shaker with ice. Shake vigorously, with the joy and love of old friends in your heart. Top with ginger beer and pour all into collins glass. Garnish with a lime wheel and server.
Alternately, strain into a coup to serve up.
Double the juices, and leave out the spirit to serve as a non-alcoholic mocktail.