In a soup pot, combine the olive oil, onion, and garlic over medium heat. When the onion begins to sizzle, add a pinch of salt and sauté until they are translucent, about 3 minutes. Add the celery and a pinch of salt; sauté for 1 minute. Add the carrot and a pinch of salt, and sauté for 1 minute more.
Add the lentils, kombu (or bay leaf), and water. Bring to a boil, uncovered, over medium heat. Boil for 2 to 3 minutes. Add the corn to the soup. Cover; reduce the heat to low, and simmer until the vegetables are soft, about 40 minutes. Remove a small amount of liquid and stir it together with the miso until it is dissolved. Stir the miso mixture gently into the pot and simmer gently, uncovered, for 3 to 4 minutes to activate the enzymes in the miso. Stir in the parsley, basil, and rosemary; remove the kombu (or bay leaf) and serve hot.
Bon appetit!
Notes
I like to make this soup in big batches because it freezes so well. I also love to make it spicy on occasion by adding crushed red pepper flakes. Err to just a pinch if you’re not into spicy flavor, but if you like it, go ahead and season to taste.