Caribbean Pineapple Ginger Cooler
["6 c. water", "3 1/2 lb. fresh pineapple, cut into small pieces (including peel and core)", "1 oz. fresh ginger root, peeled and grated (about 2 Tbsp.)", "2/3 c. sugar (or to taste)", "juice from 1 lime (or to taste)", "6 lime slices (for garnish)"]
["In large saucepan, bring water to boil; add pineapple and gingerroot and let mixture cool to room temperature, tightly covered.", "(The mixture may be left to steep overnight)."]
["water", "fresh pineapple", "fresh ginger root", "sugar", "lime", "lime"]