Colombian Beef Rib Soup

Name: Colombian Beef Rib Soup
Prep time: 15 min
Cook time: 1 h 30 min
Total time: 1 h 45 min
Cuisine: American, Latin American
Ingredients: 1 kg 2.2 lbs beef short ribs, cut into 2-inch pieces; 8 cups water; 1 large white onion (finely chopped); 4 garlic cloves (minced); 3 medium potatoes (peeled and quartered); 2 green onions (chopped); 2 ears of corn (cut into thirds); 1 cup cilantro (finely chopped (divided)); 2 tsp salt (adjust to taste); 1 tsp ground cumin; 1 tsp black pepper; White rice (optional); Lime wedges; Avocado slices