beef shoulder roast recipe

Ingredients: 3-4 pounds beef shoulder roast Salt and freshly ground black pepper, to taste 2 tablespoons vegetable oil 1 large onion, chopped 4 cloves garlic, minced 4 carrots, peeled and cut into chunks 4 potatoes, peeled and cut into chunks 2 cups beef broth 1 cup red wine (optional) 1 can (14.5 ounces) diced tomatoes