In small bowl, place mushrooms and hot water; let stand 10 minutes.
Meanwhile, spray 4- to 5-quart slow cooker with cooking spray. In small bowl, mix garlic, lemon peel, oregano and salt. Rub mixture over beef; place in cooker.
Drain mushrooms; coarsely chop. Top beef with mushrooms, tomatoes, thawed onions and wine.
Cover; cook on Low heat setting 8 to 9 hours.
Remove beef from cooker; place on cutting board. Cover; let stand 10 minutes. Cut beef into 8 serving pieces; serve with tomato mixture.