01 - Heat olive oil in a large pot over medium heat. Add the diced onions and cook for 3 to 4 minutes, stirring occasionally, until softened and translucent.
02 - Add the minced garlic and grated ginger to the pot. Sauté for about 1 minute until fragrant, being careful not to let the garlic brown.
03 - Stir in the sliced carrots and cook for 2 minutes, allowing them to lightly caramelize and absorb the aromatics.
04 - Pour in the vegetable broth and bring to a boil. Once boiling, reduce the heat to low and simmer for 18 to 20 minutes, or until the carrots are fork-tender and easily pierced.
05 - Remove the pot from heat. Using an immersion blender, purée the soup directly in the pot until completely smooth. Alternatively, transfer in batches to a standard blender and blend until silky.
06 - In a small bowl, dissolve the white miso paste with a ladleful of the hot soup. Stir this mixture back into the pot along with the soy sauce. Season with salt and pepper to taste.
07 - Return the pot to low heat and warm gently if needed. Do not bring to a boil after adding the miso, as high heat diminishes its flavor and probiotic benefits.
08 - Ladle the soup into bowls and finish with thinly sliced scallions and a sprinkle of toasted sesame seeds if desired.