1 1/2 oz of white rum (or Light Rum)
3/4 oz of dry vermouth
1/2 oz of Lemon Juice
1 dash of grenadine syrup
1/2 oz of cointreau orange liqueur (or orange liqueur)
Combine all ingredients in a cocktail shaker half-filled with cracked ice; shake well and strain into a chilled cocktail glass. Garnish with an orange twist. Grenadine and lemon juice are optional.