Place water in a medium size saucepan. Add coffee and stir over low heat until coffee is dissolved. Add chocolate and continue heating just until melted, stirring frequently. Remove from the heat and stir in liqueur. Blend wafer crumbs and sugar together; stir in liquid ingredients until well mixed. Shape into 1 inch balls. If desired, press a pecan piece in the center of each, flattening slightly. Store in a tightly covered container in a cool place for a least a week to allow flavors to blend. Makes about 3 dozen.