Peel ginger and slice thinly. In a 1-quart saucepan, combine brown sugar, ginger, peppercorns, allspice, cinnamon sticks and water.
Bring to boil, then reduce heat and simmer, uncovered, 30 minutes
Strain, discarding spices; chill. If made ahead, set aside until ready to use
To prepare punch for serving place ice block (should be 2 quarts) in punch bowl
Add chilled syrup, rum, vodka, orange juice and pineapple juice
Taste and add more juices, if desired. Poke stem of each flower through the center of a lemon slice; float slices atop punch. Serve each drink over ice cubes.
