Comforting Beef Barley Soup

Ingredients

• 1 tablespoon butter
• 1 medium carrot, chopped
• 1 celery rib, chopped
• 1/2 cup chopped onion
• 4 cups beef broth
• 4 cups water
• 2 cups chopped cooked roast beef
• 1 can (14-1/2 ounces) diced tomatoes, undrained
• 1 cup quick-cooking barley
• 1/2 teaspoon dried basil
• 1/2 teaspoon dried oregano
• 1/2 teaspoon pepper
• 1/4 teaspoon salt
• 1/2 cup frozen peas