2 1/2 ounces light rum
1 ounce frozen concentrated pineapple juice, thawed but not diluted
1/2 ounce lime juice
1 tsp sugar
Iced club soda
1 thin slice of fresh pineapple
1 lime slice

Shake rum, pineapple juice, lime juice, and sugar well with ice. Strain into a tall 14 ounce glass. Add a splash of soda and ice to fill glass. Garnish with pineapple and lime slices.