What does an apple have to do with preventing mushy onion rings?
Why This Recipe Works
What’s the secret behind a shatteringly crisp shoestring onion ring? Apple. That’s right, we found that acidic apple cider vinegar (with apple juice to balance the flavor) drew out the onion’s starch granules, leaving us with an ultra-crisp coating. Following the same theme, an initial coating of acidic cream of tartar added even more crunch.