2 large leeks, trimmed, halved lengthwise, thoroughly cleaned 2 tbsp (30 ml) olive oil, plus more for finishing 1 tbsp (14 g) unsalted butter (optional) 2 cloves garlic, thinly sliced 1 / 3 cup (80 ml) dry white wine or dry sherry 4 cups (960 ml) low-sodium chicken or vegetable stock 1 can (15 oz / 425 g) cannellini beans, drained and rinsed 4 sprigs fresh thyme, plus extra leaves for garnish 1 bay leaf 1 small piece Parmesan rind (optional) 1 tsp lemon zest, finely grated 1 tbsp (15 ml) fresh lemon juice, plus more to taste Kosher salt, to taste Freshly ground black pepper, to taste 1 tbsp (6 g) chives, thinly sliced (garnish)
Char the leeks: Heat a dry skillet or grill pan over medium-high. Brush the cut sides of the leeks with a little olive oil and cook cut-side down until deeply browned in spots, 3–4 minutes. Let cool slightly, then slice crosswise into 1/2-inch pieces. Build the base: In a medium pot, warm the olive oil and butter (if using) over medium heat. Add the leeks with a pinch of salt and cook, stirring, until softened and sweet, 5–6 minutes. Stir in the garlic and cook 30–60 seconds until fragrant. Deglaze: Pour in the wine and simmer, scraping up any browned bits, until reduced by about half, 1–2 minutes. Simmer: Add the stock, cannellini beans, thyme sprigs, bay leaf, and Parmesan rind (if using). Bring to a gentle simmer and cook 12–15 minutes to marry flavors. Blend partially: Remove and discard thyme sprigs, bay leaf, and rind. Scoop out about 1 cup of the soup and puree until smooth, then return to the pot (or briefly pulse with an immersion blender) to create a lightly creamy body while keeping it brothy. Finish: Stir in the lemon zest and juice. Season to taste with salt and black pepper, adjusting acidity with a splash more lemon if desired. Serve: Ladle into warm bowls. Garnish with chives and a few fresh thyme leaves, plus a light drizzle of olive oil.
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