01 - Heat olive oil in a large pot over medium heat. Add the diced onions and cook for 3 to 4 minutes until translucent and softened.
02 - Add the 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 caramelize and absorb the aromatics.
04 - Pour in the vegetable broth and bring to a boil. Reduce the heat to low and simmer for 18 to 20 minutes until the carrots are fork-tender.
05 - Remove the pot from heat. Use an immersion blender to puree the soup directly in the pot until completely smooth, or transfer in batches to a standard blender.
06 - In a small bowl, dissolve the white miso paste with a ladleful of hot soup. Stir the mixture back into the pot along with the soy sauce. Season with salt and pepper to taste.
07 - Warm the soup gently over low heat 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 bowls and finish with thinly sliced scallions and toasted sesame seeds if desired.