"They give onion rings a run for their money...."
INGREDIENTS
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1/4 cup mayonnaise
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2 tablespoons ketchup
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1 1/2 pounds medium cremini or button mushrooms
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1 medium lemon
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1 cup plus 2 tablespoons all-purpose flour, divided
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1 teaspoon kosher salt
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Pinch cayenne pepper
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3/4 cup buttermilk
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3/4 cup lager
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1 large egg
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6 cups neutral oil, such as canola or vegetable oil, for deep frying
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Flaky sea salt (optional)