01 - Heat olive oil in a large pot over medium heat. Add the diced onion 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 an additional 2 minutes, coating them evenly in the aromatics.
04 - Pour in the vegetable broth and bring to a rolling boil. Reduce the heat to low, cover partially, and simmer for 18 to 20 minutes until the carrots are fork-tender and easily pierced.
05 - Remove the pot from heat. Using an immersion blender, puree 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 hot soup to temper it. Stir the dissolved miso 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 beneficial properties.
08 - Ladle the soup into warm bowls. Finish with a scatter of thinly sliced scallions and toasted sesame seeds before serving.