Wash the leeks thoroughly to remove dirt. Slice all vegetables as described in the ingredients list.
Sauté The Aromatics
In your pot, heat a splash of olive oil or vegetable broth over medium heat. Sauté the leeks, onion, and celery until softened, about 5 minutes.
Add Root Vegetables And Spices
Stir in the garlic, parsnips, turmeric, salt, and pepper. Cook for an additional 2 minutes, releasing their aromas.
Simmer The Soup
Add the cauliflower and vegetable stock, ensuring the veggies are submerged. Toss in the thyme. Bring to a boil, then reduce to a simmer and cook for 20 minutes, or until the vegetables are tender.
Blend To Perfection
Remove the thyme stems. Blend the soup until smooth using an immersion blender. If using a regular blender, work in batches to avoid spills.
Adjust And Serve
If desired, whisk the miso paste with warm water and stir it into the soup. Adjust seasoning as needed and serve hot.
Notes
This leek soup is versatile and can be served hot or cold, making it suitable for all seasons. Miso adds a subtle umami flavor, but it’s entirely optional if you prefer a simpler taste.