Homemade Beef Stock for French Onion Soup

Name: Homemade Beef Stock for French Onion Soup
Ingredients: 3 pounds beef bones (such as marrow bones or shin bones); 3 pounds oxtail; 2 tablespoons olive oil; 2 tablespoons tomato paste; 2 pounds unpeeled onions, quartered; 2 large leeks, white and pale-green parts only, halved lengthwise, cut into 2-inch pieces and rinsed well; 4 celery stalks, cut into thirds; 3 large carrots, peeled, halved lengthwise, and cut into 2-inch pieces; 8 garlic cloves, coarsely chopped; 6 sprigs fresh flat-leaf parsley; 4 sprigs fresh thyme; 2 bay leaves; 2 teaspoons whole black peppercorns; 1 cup red wine