INGREDIENTS
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4 cups vegetable oil, for frying
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2 cups flour
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1/4 teaspoon cayenne pepper
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1 teaspoon baking powder
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2 teaspoons Argo cornstarch
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1/2 teaspoon salt, plus more for seasoning
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1/2 teaspoon ground white pepper
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1 (12-ounce) bottle Guinness, at room temperature
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1 large yellow onion, peeled and cut into 1/2-inch thick rings