Leftover Roast Beef Stew

Ingredients

• 1/2 onion, chopped
• 1/2 green pepper, chopped
• 1 tablespoon olive oil
• 8 -10 ounces leftover roast beef or 8 -10 ounces steak
• 2 cups beef stock (or 1 can beef broth)
• 1 cup roasted tomatoes or (14 1/2 ounce) can diced tomatoes
• 1/2 tablespoon dried oregano
• 1/2 tablespoon dried basil
• 1 cup mushroom, cut in large chunks
• 1 tablespoon chopped fresh basil