1 ½ ounces Gin
1 ounce Cointreau or triple sec
1 ounce pineapple juice
½ tsp grenadine
1 pineapple slice

In a shaker half filled with ice cubes, combine the gin, Cointreau, pineapple juice and grenadine. Shake well.
Pour into an old fashioned glass and garnish with the pineapple slice.