1 lb / 450 g celeriac (celery root), peeled and diced 1 medium Granny Smith apple, peeled, cored, and diced (reserve a few matchsticks for garnish) 1 small leek (white and light green parts), thinly sliced and well rinsed 1 small garlic clove, thinly sliced 1 tbsp unsalted butter 1 tbsp olive oil 1 / 2 cup (120 ml) dry white wine or dry vermouth 3 cups (720 ml) low-sodium chicken or vegetable stock 1 sprig fresh thyme 1 bay leaf 1 / 3 cup (80 ml) heavy cream 1 tsp fresh lemon juice, or to taste Fine sea salt and white pepper, to taste 1 / 4 cup (15 g) finely chopped fresh chives 3 tbsp (45 ml) extra-virgin olive oil Pinch of salt (for chive oil)
Make the chive oil: Blend the chives with the extra-virgin olive oil and a pinch of salt until vivid green and smooth. Strain through a fine sieve or leave rustic. Set aside. Sweat the aromatics: In a medium pot over medium heat, melt the butter with the olive oil. Add the leek and a pinch of salt and cook, stirring, until tender and translucent without browning, 5–6 minutes. Stir in the garlic for 30 seconds. Build the base: Add the celeriac and cook 3 minutes, stirring. Pour in the wine, simmer, and reduce by about half, 2–3 minutes. Simmer: Add the diced apple, thyme, bay leaf, and stock. Bring to a boil, then reduce to a gentle simmer. Cook partially covered until the celeriac is very tender, 20–25 minutes. Discard the thyme and bay leaf. Purée: Blend the soup until completely smooth (use a high-speed blender for extra silkiness). For an ultra-smooth texture, pass through a fine sieve back into the pot. Finish: Stir in the heavy cream. Adjust thickness with a splash of stock if needed. Season with salt, white pepper, and the lemon juice to brighten. Serve: Rewarm gently. Ladle into warm bowls, swirl a little chive oil over each, and garnish with a few apple matchsticks. Serve immediately.
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