Bring 2 quarts water to a boil in a medium saucepan. Add taro; cook 40 minutes or until tender. Drain; cool 15 minutes. Peel; discard skin. Roughly chop taro. Place taro and 1 cup water in a blender; process until smooth. Add remaining 1/4 cup water, 1 tablespoon at a time, until desired consistency.