Rich umami flavor makes this miso mushroom barley soup super flavorful and satisfying. Layers of flavor including onions, garlic and just a splash of balsamic make this vegan mushroom barley soup a hit with everyone, even meat eaters.
Prep veggies: dice onion, carrot, celery. Mince garlic. Use a damp paper towel to clean mushrooms and then thinly slice.
Heat a large soup pot or dutch oven over medium heat. Use broth, olive oil or water to saute onion for 2 minutes. Add celery and carrot to pot, along with salt and pepper, and continue to saute, about 5 minutes total.
Swirl in another tablespoon broth and then add the garlic and tomato paste. Cook, stirring until well incorporated and fragrant, about 2 minutes.
Put mushrooms into pot....it will be REALLY full. Gently stir and cook until mushrooms have reduced to ⅓ original size, about 5 minutes. The mushrooms will expel liquid making it easier to cook without needing to add more oil/broth.
Rinse and drain barley and add to the vegetable mixture along with 6 cups water or broth. If you need to add another cup of liquid, so all the vegetables and barley are submerged, do it now.
Bring the soup to a boil, then turn down the heat so it's gently simmering. Cook for about 45 minutes, until mushrooms are tender and barley is cooked, with still a bit of bite to it.
While the soup cooks, dilute the miso paste in ½ cup water by stirring vigorously with a small whisk or a fork so it's totally dissolved.
Turn off heat. Stir in miso mixture and balsamic vinegar. Sprinkle on some fresh parsley to garnish and serve hot.
Notes
Storage: Store in an airtight container in the refrigerator for a week or freeze for up to 3 months. Reheat gently over medium/low heat, stirring occasionally, until bubbling.