5 pound bone-in beef short ribs, cut crosswise into 2" pieces
Kosher salt and freshly ground black pepper
3 tablespoons vegetable oil
3 medium onions, chopped
3 medium carrots, peeled, chopped
2 celery stalks, chopped
3 tablespoons all-purpose flour
1 tablespoon tomato paste
1 750-milliliter bottle dry red wine (preferably Cabernet Sauvignon)
10 sprigs flat-leaf parsley
8 sprigs thyme
4 sprigs oregano
2 sprigs rosemary
2 fresh or dried bay leaves
1 head of garlic, halved crosswise
4 cups low-salt beef stock