Deep frying is something I seldom do at home - maybe once or twice a year. For these onion rings, I used beer for the batter and added some Tabasco sauce and salt for flavour. I cooked them in corn oil in a pan that had been used to fry several batches of hamburgers. I would have liked to fry them in beef fat, but wasn't sure how to go about finding and rendering beef fat in China so using the drippings from the hamburgers was the next best thing. They were amazing with ketchup.
Mix together 3/4 cup beer with 3/4 cup flour. Mix in one tablespoon of Tabasco sauce and one teaspoon of salt. Slice three medium onions into 1 cm slices and separate into rings. Meanwhile, heat oil til a drop of batter sizzles when dropped in. Coat onion rings in batter and drop into oil in one layer, turning once, til the onion rings are brown. Eat while hot.