Cut and peel the pumpkin, then dice into 1–inch cubes. Heat the olive oil in a large stock pot over medium heat. Add the leeks, onion, and herbs and sauté until translucent, about 10 minutes. Add the pumpkin cubes and chicken stock and bring to a boil. Reduce heat to a simmer, cover, and let simmer until the pumpkin is tender, about 20–30 minutes. Purée the pumpkin mixture using an immersion blender. Swirl in the butter and half and half. Add honey, nutmeg, and salt and pepper to taste.
NOTE: Instead of the usual Halloween-style pumpkin, try a bumpy Galeux d’Eysines or a pink-hued Porcelain Doll.