Savor the depth of this miso soup, a powerhouse of nutrients. Sweet potatoes contribute a natural sweetness, while miso paste adds a savory umami kick.
Peel and cube the sweet potato. The smaller you cut them the faster they will cook.
Dice the onion and celery finely. Peel and dice the carrot. Peel and mince the garlic.
In a large, heavy bottomed pot, heat the oil over medium heat.
Add the onion, celery, carrot, and garlic. Cook for 5 minutes, stirring regularly, until the onion starts to get translucent.
Add the sweet potato, ground ginger, and broth plus 1 cup/240ml water.
Cover and cook over medium-low heat for 30-40 minutes until all the vegetables are extremely soft.
Add the miso paste, salt, and pepper.
Remove from the heat and use an immersion blender to pulse everything until smooth. Alternatively, allow to cool slightly and then use a regular blender.