There was a restaurant in Mobile called the Cock of the Walk. It had some of the best skillet cornbread and pickled onion rings. They closed down several years ago and I've missed them. I took to craving the pickled onions and decided I'd check the Internet for a recipe and, lo and behold, there I found it. I made them this weekend and they're delicious.
2 cups cider vinegar
4 teaspoons of salt
1/2 cup of sugar
1/2 teaspoon garlic salt
1/4 teaspoon white pepper
4 cups of sliced sweet onions
Combine all except onions in a large saucepan. Bring to a boil. Drop in onion slices and turn off heat. Let cool and then refrigerate.