01 - Heat olive oil in a large pot over medium heat. Add diced onions and cook for 3 to 4 minutes until translucent and softened.
02 - Add minced garlic and grated ginger to the pot. Sauté for 1 minute until fragrant, stirring constantly to prevent burning.
03 - Stir in the sliced carrots and cook for 2 minutes, allowing them to lightly coat in the aromatics and begin releasing their natural sweetness.
04 - Pour in the vegetable broth and bring to a boil. Reduce heat to low 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 broth. Pour the mixture back into the pot and stir to combine. Add soy sauce and adjust 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 probiotic benefits and delicate flavor.
08 - Ladle the soup into serving bowls. Top with thinly sliced scallions and toasted sesame seeds if desired. Serve immediately.