01 -
Peel onions and slice into quarters without cutting all the way through the root to keep them blooming. Soak in cold water for 10 minutes to help them open.
02 -
In a large bowl, combine buttermilk, garlic powder, paprika, onion powder, salt, pepper, cumin, and cayenne. Soak onions for 1 hour.
03 -
In another bowl, mix flour, cornstarch, baking powder, and oregano until well combined.
04 -
Heat oil in a deep fryer or heavy pot to 350°F (175°C).
05 -
Remove onions from buttermilk, dredge in flour mixture, ensuring every petal is coated. Dip back in buttermilk, then flour again for extra crispiness.
06 -
Fry onions in batches for 3–4 minutes until golden brown and crispy. Drain on paper towels.
07 -
Mix all dip ingredients until smooth. Chill before serving with the onions.