1. Combine vodkas, Malibu rum, and pineapple juice in a large nozzled decanter or 5 quart jug.
2. Add sugar and stir until dissolved.
3. Slice the top and bottom off of a fresh pineapple.
4. Slice the pineapple in half then slice the halves in half to make quarters.
5. Cut the rind from each of the quarters, then slice the quarters into 1/2-inch thick slices.
6. This will make several bite-size wedges.
7. Add pineapple slices to decanter, and let mixture sit for 3 days.
8. To make the drink, shake 3 ounces of the martini blend with ice and strain into a chilled martini glass.
9. Garnish with one piece of pineapple from the decanter, speared on a toothpick.