Turbot Fillets with Spring Garden Vegetables and Herb-Lemon Broth

Set up a cutting board. Peel the shallot and slice it thinly. Strip the parsley leaves from the stems and reserve the stems for the broth. Using a vegetable peeler, remove 3 wide strips of lemon zest from an unwaxed lemon, taking care to avoid the bitter white pith.

In a medium saucepan, combine the fish stock, white wine, sliced shallot, parsley stems, thyme sprigs, bay leaf, peppercorns, and lemon zest strips. Bring to a gentle simmer over medium heat, then lower the heat so the liquid barely trembles, around 80°C/176°F. Infuse for 15 minutes without allowing a rolling boil.

Set a fine mesh strainer over a wide shallow pan and pour the infused broth through, pressing gently on the solids to release their flavor. Discard the aromatics. You should have roughly 700 ml of clear, fragrant broth.

On the cutting board with the chef's knife, trim the baby carrots, cut the asparagus on the diagonal into 5 cm pieces, and de-string the sugar snap peas. If any pearl onions resist peeling, score a small X at the root end and blanch for 20 seconds to loosen the skins.

Bring a separate pot of well-salted water to a rolling boil. Drop the pearl onions in and blanch for 3 minutes until just tender, then lift them out with a slotted spoon and plunge into the ice bath bowl.

Add the baby carrots to the same boiling water and blanch for 2 minutes. Lift out with the slotted spoon and transfer to the ice bath.

Using tongs, lower the asparagus pieces and sugar snap peas into the boiling water together and blanch for 1 minute only, then transfer to the ice bath to lock in the color.

Drain the chilled vegetables in a colander, spread them on a clean kitchen towel, and pat dry. Reserve at room temperature while you cook the fish.

Pat the turbot fillets dry with paper towels and season both sides with the fine sea salt and white pepper, distributing evenly.

Return the strained herb broth to a bare quiver in the wide shallow pan, about 70°C/158°F. Gently lower the turbot fillets into the broth skin side up, arranging them in a single layer so they are mostly submerged. Poach undisturbed for 6 to 8 minutes.

Check the internal temperature at the thickest part of one fillet with the instant read thermometer. The turbot reaches the safe minimum of 63°C/145°F; the flesh should appear opaque white and flake cleanly when nudged with a knife. Slide the pan off the heat the moment the target temperature is reached.

Lift the turbot fillets from the broth with a slotted spoon and set them on a warm plate. Tent loosely with foil and rest for 2 minutes while you finish the sauce.

Return the pan of broth to medium heat and reduce by about one third to concentrate the flavor, aiming for roughly 450 ml. This takes 5 to 7 minutes.

Pull the pan off the heat. Whisk in the cold butter cubes one at a time, letting each piece melt and emulsify before adding the next, until the broth turns glossy and just slightly thickened.

Stir the lemon juice into the finished broth. Taste and add a small pinch of salt if needed. Keep the broth warm but not hot.

Melt the 30 g of butter in a wide sauté pan over medium heat. Add the blanched vegetables with a pinch of salt and toss gently for 2 minutes until heated through and glossy.

Divide the warm vegetables evenly among four shallow bowls, mounding them slightly off center.

Lay a turbot fillet over the vegetables on each plate, draping it gently to show its curve.

Spoon 3 to 4 tablespoons of the herb-lemon broth around each fillet, letting the vegetables peek through rather than drowning them.

Scatter the chervil leaves and snipped chives over the top and serve immediately, with lemon wedges alongside.