Whipped up this one last night. Tangy, potent.

THE LES BAXTER

2 oz. orange juice
1 oz. unsweetened pineapple juice
3/4 oz. lemon syrup
1 1/2 oz. gold rum
3/4 oz. 151 (overproof) rum 

Shake with ice, strain into a tiki mug or double old-fashioned glass filled with ice.