1 pound 85% lean ground beef
2 tablespoons prepared horseradish
2 teaspoons Dijon mustard
1/2 teaspoon salt
1/4 teaspoon ground black pepper
4 (1/2-inch thick) slices red onion, not separated into rings
2 teaspoons olive oil
4 ounces sharp Cheddar cheese, sliced
4 large slices sourdough bread, cut in half
Lettuce leaves
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