Beef Short Rib Pho

Name: Beef Short Rib Pho
Ingredients: 7 lb. beef bones with marrow; 2 large white onions (1 lb. 9 oz.); 6-8 shallots (1 lb.); 1 4-inch piece fresh ginger; 1 piece rock sugar (1/8 oz.), or more to taste; 10 black cardamom pods; 5 star anise; 3 cinnamon sticks; 1 tbsp. coriander seed; 1 tbsp. fennel seed; 6 whole cloves; 1 lb. beef brisket; 3 lb. chuck short ribs; 1 tbsp. kosher salt, or more to taste; 1 ⁄ 3 cup fish sauce, preferably Three Crabs brand; ½ lb. eye of round, sirloin, flank steak, or London broil, sliced very thinly; 2 lb. pho rice noodles; 1 medium onion (7 oz.), very thinly sliced (1 cup); 1 bunch scallions, thinly sliced; 4 cups bean sprouts; 1 bunch cilantro; 1 bunch Thai basil; 2 limes, cut into wedges; Hoisin sauce (optional); Sriracha sauce (optional)