I'm not as crazy about battered onion rings. I prefer the breaded version. But if you want a nice, light battered onion ring, simple mix together equal parts all-purpose flour, and cornstarch, about 1/2 cup each. Add 1/2 tsp. salt, and 2 tsp. baking powder. Mix in 3/4 cup water and stir until lumps are amost gone. Dip in the onion rings and fry until golden.
If you prefer, you can omit the baking powder and add the Co2 found in sparkling water, bear, or any sparkling beverage you choose to use.
For a light crunch, omit 1/2 of the flour and replace with 1/4 cup cream of wheat.
For breaded onion rings, make an egg wash. Dip the onion rings into the egg wash, and then dredge in flour. Dip again in the egg wash, then into seasoned bread crumbs. Fry until golden brown.
Another great onion dish requires a deep fryer. Make the same batter as you would for onion rings. But peel, then slice an onion nearly through from top to bottom, in 1/8 inch slices cris-crossing at right angles. Place the partially sliced onion in water and let sit for ten minutes to open it up. Dip in the batter and deep fry until golden to make an onion flower.
Seeeeeeya; Goodweed of the North