Typically Burger King onion rings are made with white or yellow onions. You can dilute the diced onion rings in cold water before you coat and fry them. It helps in turning the flavors into sweet and mild. For making a copycat recipe of onion rings, prepare the onion flavor paste, form it in the shape of rings, dip in the flour batter, and coat them with breadcrumbs. Finally, fry the coated onion rings in preheated oil.
Prepare the onion paste to make the rings. In a blender, add white onion, plain breadcrumbs, milk, salt, cayenne pepper, and black pepper. Blend it evenly to form a wet mixture.
In a separate bowl, add flour, milk, and cayenne pepper. Mix it well to form a thick consistency.
Grease oil on your hands and start rolling out to shape the onion rings.
Coat the onion rings with dry flour mixture, milk, and at last breadcrumbs.
Put the coated onion rings to the preheated pan. Fry them until golden-brown. Take them out on a wire rack. Let the excess oil release. Serve with hot sauces!