Although it comes together simply, you’ll be wowed with the complex depth of flavor created in this soup! Kombu is a sea kelp native to Japan. It adds umami and rich nutrients to this dish. Garnish this brothy goodness with green onions, sesame seeds, and red pepper flakes for even more punch. This recipe would make an easy and delicious lunch or pair well with a more substantial dinner; whatever you’re in the mood for!