Preheat oven to 375°.
Combine pears and juice in a large bowl; spoon into a 1-quart baking dish.
Combine the apricot preserves and liqueur in a small bowl; spoon evenly over pears. Sprinkle butter over pear mixture, and top with 1 cup amaretti cookie crumbs. Bake at 375° for 30 minutes or until golden brown. Spoon pear mixture evenly into 6 bowls, and top each serving with 1/4 cup ice cream.