Place the veal in microwave safe dish. Add onion, bay leaf, salt, pepper and enough water to cover. Cover, cook on high (600-700 watts) 20 to 25 minutes, or until the veal is fork tender, skimming foam as necessary and stirring at 5 minute intervals. Remove bay leaf. On top of range, melt butter in casserole. add mushrooms, cook over medium low heat 10 minutes. Do not brown. Add flour and lemon juice, stirring to blend. Add mushroom mixture to veal. Cook uncovered on high about 5 minutes, or until the mixture thickens. Sprinkle with parsley before serving. Makes 4 servings