1 large fennel bulb, cored and chopped (reserve fronds) 1 leek (white and light green parts), thinly sliced and rinsed 1 celery stalk, chopped 2 garlic cloves, thinly sliced 1 1 / 2 cups (360 ml) cooked cannellini beans, rinsed and drained 4 cups (960 ml) low-sodium chicken broth or vegetable broth 2 tbsp (30 ml) olive oil, plus 1 tbsp (15 ml) for drizzle 1 bay leaf 1 tsp fresh thyme leaves or 1 / 4 tsp dried thyme 1 / 2 tsp kosher salt, plus more to taste 1 / 4 tsp ground white pepper 1 tsp finely grated lemon zest, divided 1 tsp lemon juice (optional, to taste) 1 tsp finely chopped fennel fronds, plus more for garnish Shaved Parmesan, for garnish (optional)
Heat oven to 425°F/220°C. Toss the chopped fennel with 1 tablespoon olive oil and a pinch of salt on a sheet pan. Roast until tender and caramelized at the edges, 18–22 minutes. Meanwhile, warm 1 tablespoon olive oil in a pot over medium heat. Add leek and celery with a pinch of salt; cook until soft and sweet, 5–7 minutes. Stir in garlic and cook 30 seconds until fragrant. Add roasted fennel, cannellini beans, broth, bay leaf, and thyme. Bring to a gentle simmer and cook 12–15 minutes to meld flavors. Remove bay leaf. Blend the soup until silky-smooth (use an immersion blender, or carefully vent the lid of a countertop blender). Return to the pot if needed. Stir in 1/2 teaspoon lemon zest, white pepper, and salt to taste. Add lemon juice if you want extra brightness. Make the lemon‑frond oil: In a small bowl, combine remaining 1 tablespoon olive oil, remaining 1/2 teaspoon lemon zest, 1 teaspoon finely chopped fennel fronds, and a pinch of salt. Ladle soup into bowls. Drizzle with lemon‑frond oil and garnish with shaved Parmesan and additional fennel fronds, if desired. Serve alongside the chicken and spinach sauté.
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