I place a sliced onion in my drum with a bit of hickory. Smoked them as long as I could at 300 degrees. I didn't want the rings to cook, just take on as much smoke as possible..
1 cup of flour
1 tsp salt
1 tsp baking powder
enough beer to make a pancake like batter
(about 3/4 of a beer)
I used Tecate in this.. stronger beer such as lager will over power the smoke flavor.
I flour the rings before dipping in batter....
fry til golden...
season with salt....
I like em. :)