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Mix beef with the onion, parsley, salt, pepper, Worcestershire sauce and garlic. Shape into pattie. Brush lightly with olive oil and grill until desired doneness.
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Meanwhile, toast bun and spread mustard on bottom half. Warm onion and cook bacon.
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Put burger on bottom half of bun, top with onions and Swiss. Melt cheese under a broiler.
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Top with tomato slice, lightly seasoned with salt and pepper. Top with bacon and Sharp Cheddar. Melt cheese under a broiler, top with bun.