2 large onions, cut into 1/4-inch thick slices and separated into rings
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fine salt to taste
Instructions
Heat oil in a deep fryer or large saucepan to 350 degrees F (175 degrees C).
Whisk together flour, cornstarch, potato flakes, and cayenne pepper in a large bowl. Whisk in club soda to make a smooth batter. Place bread crumbs in a shallow pan.
Working in batches, dip onion rings into batter, then press in bread crumbs to coat.
Cook coated onion rings, a few at a time, in hot oil until golden brown, 2 to 3 minutes. Transfer to a cooling rack set over paper towels to drain.