Using a marinade is a great way to ensure well flavored and tender meat. The effort of making a marinade is minimal and your fridge does most of the hard labor; but the results can be incredible.
Use whatever you’ve got at hand: a "cream of something" soup, store-bought or homemade beef broth ... tough steak with acidic marinades in the refrigerator in 40+ minutes. With stir-fried dishes, ...