Sous Vide Butternut Squash

PREHEAT THE SOUS VIDE BATH
Fill a large heatproof container or stockpot with warm water. Clip an immersion circulator to the side and set the bath to 85 degrees C / 185 degrees F. This temperature holds the squash just above the pectin-breakdown threshold without collapsing its cellular structure - the core of its yielding, almost meaty texture. Allow 15-20 minutes for the bath to reach temperature.

PREPARE THE SQUASH
Peel the neck of the butternut squash (which is seedless and uniform). Cut crosswise into 3/4-inch (2 cm) thick rounds, then trim each round into clean rectangles or half-moons of equal thickness - uniformity is what makes sous vide look composed on the plate. Lightly salt both sides with the 3/4 tsp fine sea salt and let sit for 10 minutes, then pat dry. The brief dry cure draws surface moisture off before the bag.

BAG AND SEAL
Arrange the squash pieces in a single layer inside a vacuum bag (or zip-top bag). Distribute the cold cubed butter, a pinch of brown sugar if using, and the thyme sprigs evenly among the pieces. Vacuum-seal, or use the water-displacement method: zip the bag almost closed, lower it into the bath so water pressure pushes the air out, then seal.

COOK SOUS VIDE
Submerge the bag fully in the 85 degrees C / 185 degrees F bath and cook for 45-55 minutes. The squash should yield easily to a toothpick but still hold its shape when lifted. Target texture: firm-tender, dense, translucent at the edges. Remove the bag and rest for 5 minutes before opening - the bag juices are concentrated squash liquor and are worth reserving for the plate.

MAKE THE TAHINI BASE
While the squash cooks, whisk the tahini in a bowl with the lemon juice. It will immediately seize and thicken - this is correct. Add the cold water a tablespoon at a time, whisking after each addition, until the sauce loosens into a smooth, pourable ribbon that coats the back of a spoon. Grate in the garlic (if using) and season with the 1/2 tsp fine sea salt. Taste: it should be bright, nutty, faintly bitter, and still a touch thicker than cream.

SMOKE THE TAHINI
Transfer the tahini sauce to a wide shallow bowl - surface area matters, as more surface absorbs more smoke. Load a small pinch of applewood or cherrywood chips into the chamber of a smoking gun. Cover the bowl loosely with plastic wrap or a glass cloche, leaving a small gap for the smoke hose. Light the chips, fill the covered space with dense white smoke, then seal the gap. Rest for 8-10 minutes. Repeat the infusion a second time for a deeper, more architectural smoke presence. Whisk briefly before serving to redistribute.

BROWN THE BUTTER
Just before plating, melt the 2 tbsp finishing butter in a small pan over medium heat. Swirl continuously until the milk solids turn a deep hazelnut brown and the butter smells distinctly nutty - about 3-4 minutes. Immediately remove from the heat and pour through a fine sieve into a warm ramekin.

PLATE
Pour a wide, shallow pool of smoked tahini onto each warm serving plate, tilting gently to spread. Arrange the sous vide squash pieces in the centre, slightly overlapping if presenting multiple pieces. Spoon a small amount of the reserved bag liquor over the squash. Drizzle the beurre noisette over and around - the fat droplets should bead on the tahini rather than disappear into it. Scatter the toasted sesame and nigella seeds, finish with flaky salt, cracked black pepper, and micro chervil or thyme tips. Serve immediately while the squash is still warm and the tahini cool.

CHEF'S NOTES
Recipes for sous vide butternut squash commonly suggest anywhere from 82 degrees C to 90 degrees C. The higher end produces a softer, more puree-like result; the lower end keeps the squash firmer but risks undercooking at the pith. 85 degrees C is the deliberate middle. If you prefer a slightly more yielding texture, 87 degrees C for 50 minutes is a safe adjustment. Tahini is an unusually receptive medium for smoke: sesame oil and smoke share overlapping aromatic compounds, so the tahini absorbs and amplifies the smoke rather than fighting it. A warm component (squash, about 60 degrees C on the plate) and a cool component (room-temperature tahini) in the same bite is what keeps a two-ingredient plate from flattening.

TROUBLESHOOTING
Squash comes out watery or floppy: bath too hot (above 88 degrees C), or over-salted before bagging. Hold strictly at 85 degrees C, salt lightly, and discard accumulated water in the bag before plating. Squash is still raw at the centre: verify bath temperature with a digital thermometer, cut uniform pieces, and extend cook time to 60 minutes. Tahini sauce is gritty or thick: stir tahini thoroughly from the bottom of the jar before measuring; add water one teaspoon at a time past the seize point. Smoke flavour is harsh or acrid: use only fruitwood (apple, cherry, pecan - never mesquite or pine), rest between infusions, and one or two infusions is plenty. Smoke flavour is undetectable: use a wide shallow dish, seal the cover tightly after filling with smoke, and rest a full 8-10 minutes. Beurre noisette burns: medium heat only, swirl constantly, pull as soon as the milk solids turn hazelnut brown.

STORAGE AND MAKE-AHEAD
Squash in its sealed bag after cooking can be plunged into an ice bath and refrigerated for up to 3 days. To reheat, return the bag to a 60 degrees C / 140 degrees F bath for 20 minutes. Smoked tahini sauce holds in the fridge for up to 4 days in a tightly closed jar; re-smoke briefly if the smoke character has faded, and whisk in a teaspoon of warm water to re-emulsify. Beurre noisette is best made a la minute but can be held warm for 30-45 minutes over a gentle water bath. The plated dish does not hold - plate and serve in one movement. The bag juices freeze beautifully and are an excellent base for a future squash soup or risotto.

VARIATIONS
Without an immersion circulator: wrap the squash, butter, and aromatics tightly in a double layer of foil and roast at 93 degrees C / 200 degrees F for 75-90 minutes. Without a smoking gun: place a small piece of smouldering wood chip on foil inside a large covered pot or lidded bowl, rest the tahini bowl on top of an inverted ramekin inside, cover, and rest 10 minutes. Persian accent: finish with a teaspoon of pomegranate molasses alongside the beurre noisette, a few pomegranate seeds, and a torn mint leaf. Delicata or kabocha squash can be substituted - both hold up to sous vide and produce a similar texture profile.