5 onions (or what you have on hand)
1 jar of Barbecue sauce (or enough to combine sufficiently with the quantity of onions you are using)
butter (and olive oil if desired)
salt & pepper
Slice onions into thin rings. Heat butter or a combination of butter and olive oil in a heavy skillet. Add onions and slowly cook over medium heat. Cook until the onions are caramel colored, stirring often, about 30 to 40 minutes depending on quantity of onions.
Combine cooked onions with barbecue sauce. Heat thoroughly if needed. Serve on buns. Add garnish as desired.