Eggs, flour, seasonings, parsley, onion, and ground beef should all be combined well in a large bowl. Into six patties, form. Cook patties to desired doneness after melting butter in a pan. Burgers should be removed to a serving plate and kept warm.

Onion rings should be tender and brown when cooking in pan juices. Over hamburgers, spoon onions and any residual cooking juices. Serve right away.