INGREDIENTS
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9 tablespoons butter, at room temperature, divided
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1 red onion, sliced 1/8" thick
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Salt and pepper
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8 slices classic white bread
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8 slices Wisconsin American Cheese
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4 slices Wisconsin Sliced Swiss
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8 ounces smoked ham, sliced
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2 large heirloom or beefsteak tomatoes, sliced 1/4" thick (8 slices)