8 lbs. beef shanks, cut crosswise into 2"-thick, bone-in pieces
1/4 cup Chinese rice wine
3 tbsp. whole black peppercorns
14 cloves garlic, crushed
8 plum tomatoes, quartered
8 whole star anise pods
4 yellow onions, quartered
2 dried chiles de árbol
1 4" piece ginger, chopped
3 tbsp. Chinese black vinegar
Dark soy sauce, kosher salt, and sugar, to taste
12 baby bok choy
1½ lbs. thin egg noodles
Chopped pickled Chinese greens, for serving