Preheat oven to 250F. and line a large baking sheet with paper towels. With a mandoline or other manual slicer, slice onion paper-thin and separate into rings. In a deep kettle or deep fryer heat 2 inches oil to 375øF. While oil is heating, in a large bowl stir together flour and chipotle rub. Add onion rings and toss well to coat. Transfer onion rings to a large sieve and shake gently to remove excess flour mixture.
Add a handful of onion rings to hot oil and fry, stirring, until crisp, about 30 seconds, transferring with a slotted spoon to baking sheet to drain. Fry remaining onion rings in same manner. (Onion rings may be made 15 minutes ahead and kept warm in a 250F. oven). |
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