Step 1

In a large soup pot over medium heat, warm the olive oil. Add the leeks and sauté, stirring constantly, until tender, about 5 minutes. Add the cauliflower and sauté for about 5 minutes. Add the stock, cream, bay leaf and coriander, bring to a simmer and reduce the heat to medium-low. Simmer, stirring occasionally, until the cauliflower is very tender, about 45 minutes. Remove the bay leaf.

Step 2

Using a stick blender, puree the soup directly in the pot until it is very smooth and creamy. Alternatively, using a food processor, puree the soup in batches. Press the soup through a chinois or other fine-mesh sieve set over a clean saucepan or soup pot. Season with salt and white pepper. Keep the soup warm over low heat until ready to serve.

Step 3

Ladle the soup into warmed individual bowls, drizzle each serving with a few drops of truffle oil and garnish with a pinch of chives. Serve immediately.