Start with 3/4 to a pound per man of top round, slice thin on a deli slicer. Chop Green and red peppers and vidalia onions. Combine the ingredients with worcestershire sauce, salt, pepper and Balsamic vinegar to taste. Allow to marinate for at least two hours. Cook on a flat top griddle, adding cheese after cooking.
The balsamic vinegar reduces nicely and makes the meat very tender. Try it and let me know what you think