INGREDIENTS
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1/2 bourbon (to taste)
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1/2 cup brown sugar
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1 teaspoon Worcestershire sauce
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1/4 cup soy sauce
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1 medium-size yellow onion
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cut crosswise into 1/4-inch-thick rings
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2 pounds sirloin steak tips or flank steak
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Kosher or sea salt
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Freshly ground black pepper