Preheat oven to 325° F.
Remove most of the fat from the brisket and wash and dry. Sprinkle with salt and pepper.
Place the meat, fat side up, in a heavy casserole dish and cover with the onion, celery, chili sauce, water and parsley. Bake, uncovered, in preheated oven for 1 hour.
Pour the beer over the beef and bake, covered, 3 more hours or until tender.
Cool to room temperature, refrigerate, skim off the fat, slice and reheat in the drippings.
Servings: 10