Step 2
Combine water and kombu in a large soup pot over medium heat; bring to a gentle simmer. Turn off heat and pour through a fine sieve or strainer. Pour broth back into the soup pot and discard the kombu. Add mushrooms, kimchi, bell pepper, green onions, miso, soy sauce, rice vinegar, mirin, maple syrup, ginger, sesame oil, garlic, lime juice, salt, and pepper. Bring to a simmer and cook for 15 minutes. Turn off heat and adjust seasoning, if necessary.