Make the cookie dough and chill it as directed in steps 1 and 2 of the recipe for Fig and Raisin Fruit Newts.
Make the filling: In a saucepan, combine the prunes and the water. Bring them to a boil over medium heat, then lower the heat and simmer the prunes, uncovered, about 20 minutes, or until they are quite tender. If there is a great deal of liquid (there s