INGREDIENTS
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One 5- to 7-pound roaster chicken, butterflied
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Kosher salt and freshly ground black pepper
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Neutral oil, for oiling grill grates
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3 tablespoons unsalted butter
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2 tablespoons grated onion
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1/8 teaspoon allspice
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Kosher salt and freshly ground black pepper
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2 cloves garlic, grated on a rasp or finely minced
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1/4 cup packed light brown sugar
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1 tablespoon stone-ground mustard
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2 teaspoons apple cider vinegar
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1/4 teaspoon hot sauce, such as Frank's RedHot