Mai Tai

2 parts dark rum
2 parts white rum
1 part curacao
1 part grenadine
2 parts pineapple juice
dash orgeat syrup
1 part lime juice

Shake all together v. well (except paper umbrella, pineapple spear and ice cubes). Strain into highball glass over ice cubes. Garnish with pineapple spear on rim and paper umbrella

The paper umbrella is the most important part.