Heat oven to 450. Toss cauliflower and fennel with 1/2 teaspoon salt and 1 tablespoon of olive oil and roast for 30 minutes until starting to blacken and brown.
In a heavy soup pot, heat the other tablespoon olive oil until shimmering.
Add the leeks and shallot and cook until fragrant, about 5 minutes. Be careful not to brown.
Add the garlic, 1/2 teaspoon of salt, and coriander and cook 1 minute more.
Add the roasted cauliflower & fennel, stock, lemon, sugar, and Pernod Classic.
Simmer for 15 minutes to meld the flavors. Transfer to a vitamix or blender, blend until completely smooth, and return to the pot through a sieve for an extra refined texture or don’t sieve for a more rustic texture. If the soup is too thick, thin with additional stock.
Stir in the cream until combined.
Season to taste with salt, sugar, and lemon juice.
Serve hot with fennel fronds and a drizzle of cream.