Combine all of the ingredients except for the water in a large pot. Add the water gradually, stirring to incorporate the ingredients evenly, especially the miso paste.
Bring the mixture to a boil, then cover the pot and reduce to a gentle simmer. Cook for 30 minutes.
Strain the broth through a sieve. For very clear broth, layer the sieve with cheesecloth first.
Prepared broth can be stored for a week in the fridge, and freezes great for at least a month.
Notes
Recipe adapted from America's Test Kitchen.Nutrition facts are an estimate based on the assumption that some of the nutrition is retained by the solids which are strained out of the broth after cooking.