In crockpot, sprinkle beef with dry onion soup mix. Pour hot water over meat. Stir in carrots, celery and tomato. Cover and cook on low 4-6 hours or until meat is tender. Turn control to high. In a small bowl, combine biscuit mix with parsley. Stir in milk with fork until mixture is moistened. Drop dumpling mixture into crockpot with a teaspoon. Cover and cook on high for 30 minutes.