"A tender steak flavored with Ireland's best export (other than U2). Inspired by Boomdog02's "Grilled 'Stout' Skirt Steak."..."
INGREDIENTS
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1 (11.2 ounce) bottle Guinness(R) stout or other dark beer
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1/3 cup brown sugar
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1 medium onion diced
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1/4 cup olive oil
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1/4 cup red wine vinegar
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3 tablespoons chopped garlic
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2 tablespoons hot sauce
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1 flat iron steak (or more)