For a richer flavor, consider adding a few pieces of kelp (kombu) to the anchovy broth during simmering. Remove the kelp before adding the other ingredients. Adjust the amount of gochujang to your spice preference. Start with less and add more to taste. If you can't find Korean fish cakes, you can substitute with other types of fish cakes or omit them altogether. Tteokbokki is best enjoyed hot and fresh. Leftovers can be stored in the refrigerator for up to 2 days, but the rice cakes may become slightly less chewy. Some people like to add a sliced hard-boiled egg as a garnish.