In a larger pot, put spinach, crushed garlic, then pouring water and broth; Season it with Soy sauce to taste and about 1/2 Tbs. Of Korean chili paste (gochujang), let it boil for 10 minutes on medium high. *If you are using frozen spinach, let it cook perhaps two minutes longer.
This soup does not have to be spicy, you can leave out red hot chili bean paste - gochujang. You may add more Beef broth if you like to have more. Adjust the Soy sauce to your taste. Instead of Beef broth (store or homemade), you can use Chicken Stock or Vegetable. Softer tofu is usually served in broth/soup/stew, but for this one, I actually like firm tofu. Be the judge and see which one do you like better! Instead of the Spinach, you may use chopped Kale, but remember that kale leaves are tougher, so you have to let it cook 10-15 minutes longer.