Here’s a quick recipe snipped from an old newspaper and found in a large collection, date unknown. I’ve typed it below along with a scanned copy.
Dilly Onion Rings
Cut one large onion in thin slices; separate into rings. Combine: one-third cup sugar, two teaspoons salt, one teaspoon dill seed, one-half cup white vinegar and one-fourth cup water. Stir and pour over onion rings. Cover; refrigerate.