Scrub celery, remove top leaves and cut each head lengthwise through heart, making 4 or 5 slender sections.
If very long, cut in half cross-wise.
Place onion in casserole, and arrange celery on top.
Dot with butter or margarine, and sprinkle with pepper.
Add undiluted consomme, cover and bake 1 hour at 350Ã‚Â°F.
Sprinkle with parsley before serving.
Salt may be needed, depending on strength of consomme.