INGREDIENTS
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1 each, 8-ounce package mushrooms (button or brown are most common)
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1 pound ground chuck
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1 teaspoon kosher or sea salt
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Olive oil for cooking
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6 small brioche rolls (or other hamburger buns)
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6 slices American cheese
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1 ounce mayonnaise
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18 pickle slices
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1 ounce white onion, diced
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3 ounces iceberg lettuce, shredded
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1 large tomato, sliced