The outstanding flavor of this soup belies how simple it is to prepare. It gets its creaminess and flavor from roasted cauliflower and tender, sweet leeks rather than dairy or flour.
Preheat the oven to 425°F. Toss together on a large rimmed baking sheet:
Roast until the edges of the florets are quite browned, about 30 minutes. Heat in a soup pot or Dutch oven over medium heat:
Add and sauté until softened, about 5 minutes:
Add the roasted cauliflower along with:
Simmer, covered, for 10 minutes. Puree the soup with an immersion blender (or in batches in a food processor or regular blender) until smooth. Return to the pot and season to taste with:
Add more vegetable broth or water if needed to thin the soup to the desired consistency.
Stir together in a small bowl:
Serve the soup drizzled with the paprika oil.