1/4 cup mashed drained canned kidney beans |
1 pound ground beef (7% fat) |
6 tablespoons hickory barbecue sauce |
4 teaspoons prepared white horseradish |
4 teaspoons minced garlic |
1/2 teaspoon salt |
1/2 teaspoon pepper |
nonstick vegetable oil spray |
4 oversize wheat rolls, halved |
4 1/3-inch-thick slices red onion |
watercress sprigs |