Secret Ingredient Beef Stew

Name: Secret Ingredient Beef Stew
Ingredients: 5 pounds beef stewing meat, cut into 2- to 3-inch pieces; Kosher salt and freshly ground pepper; 1/3 cup mixed olive oil and canola oil; 1 large onion, finely chopped; 4 celery ribs, finely chopped; 2 carrots, finely chopped; 2 leeks, washed well and thinly sliced; 8 garlic cloves, finely chopped; 4 ounces white mushrooms, roughly chopped; 1/4 cup tomato paste; 2 anchovies; 1 cup red wine; 1 cup canned whole tomatoes with juices; 1/2 cup red wine vinegar; 3 cups (or more) homemade or store-bought beef broth; 3 bay leaves; 3/4 teaspoon dried thyme; 1/3 cup chopped parsley