1. Assemble aromatics: Enclose ingredients in cheesecloth and tie with string.
2. Make soup base: Put aromatics bundle in a stockpot and add remaining soup base ingredients, including 1 tbsp. salt, but excluding broth, carrot juice, and olive oil.
3. Cover, bring to simmering over high heat, then reduce heat to medium and cook until apples are very soft, about 30 minutes. Add broth, return to a simmer, and continue cooking until potatoes are falling apart, about 2 hours.
4. Discard aromatics bundle. Purée soup in batches in a blender until silky smooth; pour into a large bowl as you go. Return soup to pot. Stir in enough carrot juice so soup is fairly thin but velvety. Just before serving, stir in olive oil.
5. Ladle soup into bowls and drizzle with cumin oil. Add a little pickled celery, and sprinkle with chives and microgreens. Season to taste with salt.
*Find at some specialty grocery stores.