INGREDIENTS
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1 head of garlic, halved horizontally
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1/2 small onion, cut into 3/4' rounds
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2 Fresno chiles or 1/2 red bell pepper
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1/2 teaspoon vegetable oil
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Kosher salt and freshly ground black pepper
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1/4 cup Worcestershire sauce
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1/4 cup red wine vinegar
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1 tablespoon (packed) dark brown sugar
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1 teaspoon porcini powder