Golden Turmeric Noodle Miso Soup

Name: Golden Turmeric Noodle Miso Soup
Cuisine: Asian, Japanese
Ingredients: 6 cups water; 1 strip of kombu (rinsed); 3 scallions (chopped); 1 large carrot (thinly sliced); 2 tablespoons grated ginger; 2 garlic cloves (minced); ¼ cup white miso paste; ½ teaspoon ground turmeric; ½ teaspoon freshly ground black pepper; 2 tablespoons lemon juice; 1 tablespoon lime juice; ½ tablespoon coconut oil; 1 tablespoon tamari; 2 teaspoons sriracha; 7 ounces tofu (cubed); 2 1/2 ounces cooked rice noodles (and/or zucchini noodles (1 small zucchini)); 2 baby bok choy (stalks thinly sliced, leaves torn); ¼ teaspoon sea salt (optional); Fresh mint or cilantro (optional for serving); Pinch of red pepper flakes (optional)