1In 4-quart Dutch oven, heat oil over medium heat. Cook onion, bell pepper, mushrooms and corn in oil about 5 minutes, stirring frequently, until onion is crisp-tender. Add barley, stirring about 1 minute to coat.
2Stir in wine and 1/2 cup of the vegetable stock. Cook 5 minutes, stirring frequently, until liquid is almost absorbed. Repeat with remaining stock and 3 cups water, adding 1/2 to 3/4 cup of stock or water at a time and stirring frequently, until absorbed.
3Stir in tomatoes, 1/3 cup of the cheese, the basil and pepper. Cook until thoroughly heated. Sprinkle with remaining 1/3 cup cheese.