Combine the first 8 ingredients in a medium bowl. Divide the lamb mixture into 4 equal portions, and shape into 1/2-inch-thick patties. Prepare grill or broiler. Place the patties on a grill rack or broiler pan, and cook 7 minutes on each side or until the lamb is done. Place the patties on bottom halves of sandwich buns, and spread each patty with 1 tablespoon savory chutney. Cover with sandwich bun tops.