Caldo de Res: Spanish Beef Soup

Name: Caldo de Res: Spanish Beef Soup
Ingredients: 2 pounds beef shank, bone-in; 1 medium-sized white onion, small dice, plus 1 cup chopped onion, for garnish; 1 tablespoon salt; 1 tablespoon pepper; 12 ounces beef stock; 12 ounces stewed tomatoes; 4 ears corn; 4 baking potatoes, like russets, unpeeled; 2 chayote, zucchini may be substituted; 6 carrots, peeled; 1/4 cup chopped cilantro, plus more, for garnish; Water, to cover; 1 head cabbage; 1 lime or lemon, cut into wedges; Corn tortillas, for garnish; Sliced jalapenos, for garnish