In a shaker filled halfway with ice cubes, combine the gin, triple sec, pineapple juice, and grenadine. Shake well. Pour into an old fashioned glass and decorate with the pineapple slice.
drink_wordpress:
1 1/2 ounces gin
1 ounce triple second
1 ounce pineapple juice
1/2 teaspoon grenadine
1 pineapple