Cut the top of the Sweet Onion (1).
Lace the onion cut-side down, and, using a sharp knife, make 1/2-inch cuts in a circular motion to create "petals." Flip the onion over and, using your hands, begin coaxing apart its layers.
In a large bowl, combine All-Purpose Flour (2 1/2 cup), Cayenne Pepper (1 teaspoon), Paprika (2 tablespoon), Dried Oregano (1/2 teaspoon), Salt (to taste), Garlic Powder (1 teaspoon) and Freshly Ground Black Pepper (to taste).
Place the onion cut-side down in the bowl, cover with a plate, and shake to coat onion and each "petal."
Meanwhile, in a separate medium bowl, mix large Large Egg (2) with Milk (1 cup). Dip onion in egg wash cut-side down; shake off excess egg wash and return onion to flour mixture to coat a second time. Shake off any excess flour.
In a deep-fryer or a heavy Dutch oven, heat Corn Oil (as needed) to 375 degrees F (190 degrees C), adding enough oil so that the entire onion will be able to float.
Meanwhile, in a separate bowl, combine dip ingredients until well-mixed. Set aside.
In the deep-fryer or Dutch oven, add the onion cut-side down in the oil for 2-3 minutes, then carefully flip the onion and allow it to fry for an additional 2-3 minutes or until the batter is golden brown.
Move it to a plate covered in paper towels to drain off excess oil and season with a little Seasoned Salt (1 teaspoon).
Serve immediately with sauce.