Caldo de Res (Mexican Beef Soup)

Caldo de Res (Mexican Beef Soup) Ingredients: 2 lbs beef shank or beef chuck roast, cut into chunks 1 onion, peeled and halved 4 cloves garlic, peeled 2 bay leaves 1 teaspoon whole black peppercorns Salt, to taste 8 cups water (or beef broth for richer flavor) 2 ears of corn, husked and cut into thirds 2 large carrots, peeled and cut into chunks 2 large potatoes, peeled and cut into chunks 2 chayotes, peeled and cut into chunks (optional) 2 zucchinis, cut into chunks 1/2 head of cabbage, cut into wedges Fresh cilantro, chopped, for garnish Lime wedges, for serving Sliced jalapeños or hot sauce, for serving (optional)