1 oz sweet vermouth1 oz dry vermouth1 oz dry gin¾ oz pink grapefruit juice1 tsp maraschino
instructions :

Shake well with plenty of ice cubes.

Strain into a chilled cocktail glass.

Serve with a dish of almonds on the side.

source :
Beachbum Berry’s Potions of the Caribbean, created by Constantino Ribalaigua Vert, La Florida (Havana)