Place grilling pan on unheated side of two-burner gas grill with one burner heated to medium. (For one-burner gas grill, place pan on grill over low heat. For charcoal grill, move medium coals to edge of firebox; place pan on grill rack.) Cover grill; cook 10 minutes or until crusts are lightly golden. Remove from grill to cooling rack; cool completely. Remove tart shells from pans.