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Prepare the Onion:
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Peel the onion, leaving the root end intact. Slice about ½ inch off the top (the pointy end) to create a flat surface.
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Place the onion cut-side down on a cutting board. Starting about ½ inch from the root, make a downward cut to the board. Repeat, making 16-20 evenly spaced cuts around the onion to create sections.
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Gently turn the onion over and use your fingers to carefully separate the outer “petals.” You can also place the onion in a bowl of cold water for a few minutes to help it bloom open.
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Create the Dredging Stations:
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In a large bowl, whisk together the flour, paprika, garlic powder, onion powder, cayenne, salt, and black pepper.
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In a separate, medium-sized bowl, whisk the eggs and milk until fully combined and smooth.
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Coat the Onion:
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Place the prepared onion into the seasoned flour mixture. Use your hands to gently coat every petal, ensuring the flour gets into all the crevices. Shake off any excess flour.
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Finally, give the onion a second coating in the seasoned flour mixture. This double-dredging is the secret to an extra-crispy crust.
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Heat the Oil and Fry:
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Pour oil into a heavy-bottomed pot or deep fryer until it’s at least 3-4 inches deep. Heat the oil to 375°F (190°C).
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Carefully lower the coated onion into the hot oil, root-side up. Fry for 5-7 minutes, or until the entire onion is a deep golden brown and crispy.
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Use a slotted spoon or spider strainer to remove the Bloomin’ Onion from the oil. Let it drain on a wire rack or a plate lined with paper towels.
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Make the Dipping Sauce:
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While the onion fries, combine all the sauce ingredients—mayonnaise, ketchup, horseradish, paprika, salt, black pepper, and cayenne—in a small bowl. Stir until smooth.
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Transfer the hot, crispy Bloomin’ Onion to a serving plate. Place the dipping sauce in a small bowl in the center or serve it on the side. Enjoy immediately!
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Tips for Success:
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Patience is Key: Take your time cutting the onion. A sharp knife and careful cuts will ensure it blooms beautifully.
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Oil Temperature: Use a deep-fry or candy thermometer to monitor the oil temperature. If the oil is too cool, the onion will be greasy; if it’s too hot, the coating will burn before the onion cooks through.
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Safety First: Always lower food into hot oil away from you to avoid splashes.