Quick Recipe Version (TL;DR)
Quick Ingredients
- 1 1/2 lb (680 g) skinless swordfish loin, center-cut
- 1 1/4 tsp fine sea salt + pinch kosher salt (for poaching water)
- 1/2 tsp freshly ground black pepper
- 1 tsp granulated sugar
- Zest of 1 large lemon + 2 tbsp lemon juice
- 4 tbsp mixed fresh herbs (parsley, dill, chives, thyme), finely chopped
- 2 tbsp extra-virgin olive oil
- 6 cups water + 1 cup dry white wine
- 1 small onion, 4 garlic cloves, 1 lemon, 1 bay leaf, 8 peppercorns
- Flaky sea salt, extra herbs, lemon wedges, sliced cucumber/radishes (for serving)
Do This
- 1. Trim swordfish into a neat block; season with sea salt, sugar, pepper, lemon zest, and half the chopped herbs. Chill 15–20 minutes.
- 2. Lay out overlapping plastic wrap, scatter a little zest and herbs, and roll the fish up into a very tight 2 to 2 1/2 inch cylinder (torchon). Twist and tie the ends; double-wrap and chill 20–30 minutes to firm.
- 3. In a wide pot, combine water, wine, onion, garlic, sliced lemon, bay leaf, peppercorns, and a pinch of salt. Heat to a gentle 160°F (71°C) so the water steams but does not simmer hard.
- 4. Submerge the wrapped torchon and poach at 160°F (71°C) for 25–30 minutes, keeping the water temperature steady.
- 5. Transfer the torchon to an ice bath for 15–20 minutes, then refrigerate at least 2 hours (or up to 24) until completely chilled and very firm.
- 6. Whisk olive oil, lemon juice, Dijon, and remaining herbs into a loose lemon-herb dressing. Season to taste.
- 7. Unwrap the cold torchon, trim the ends, and slice into 1/2 inch rounds. Arrange on a platter, spoon over dressing, sprinkle with flaky salt and herbs, and serve with lemon wedges and crisp vegetables or toast.
Why You’ll Love This Recipe
- Transforms simple swordfish into an elegant, make-ahead appetizer that feels restaurant-worthy but uses basic tools.
- Gentle poaching and chilling create a firm, sashimi-like texture that slices into beautiful, clean rounds.
- Bright lemon and fresh herbs keep the flavor light, fresh, and perfect for warm-weather gatherings.
- Serves cold, so it is ideal for entertaining: make it the day before and just slice and plate before guests arrive.
Grocery List
- Produce: 2 lemons, 1 small onion, 4 garlic cloves, fresh parsley, fresh dill, fresh chives, fresh thyme (optional), cucumber and radishes (optional for serving), fresh herbs for garnish.
- Dairy: None required.
- Pantry: Swordfish loin (about 1 1/2 lb), extra-virgin olive oil, dry white wine, fine sea salt, kosher salt, black pepper, granulated sugar, Dijon mustard, bay leaf, black peppercorns, flaky sea salt, baguette or crackers (optional for serving).
Full Ingredients
Lemon-Herb Swordfish Torchon
- 1 1/2 lb (680 g) swordfish loin, skinless and boneless, preferably center-cut
- 1 1/4 tsp fine sea salt
- 1/2 tsp freshly ground black pepper
- 1 tsp granulated sugar
- Zest of 1 large lemon (about 1 tbsp packed), very finely grated
- 2 tbsp finely chopped fresh flat-leaf parsley
- 1 1/2 tbsp finely chopped fresh dill
- 1 tbsp finely snipped fresh chives
- 1 tsp fresh thyme leaves (optional, finely chopped)
Poaching Liquid
- 6 cups (1.4 L) water
- 1 cup (240 ml) dry white wine (such as Sauvignon Blanc or Pinot Grigio)
- 1 small yellow onion, sliced
- 4 garlic cloves, lightly smashed
- 1 small lemon, sliced
- 1 bay leaf
- 8 whole black peppercorns
- 1 tsp kosher salt
Lemon-Herb Dressing & Serving
- 2 tbsp extra-virgin olive oil
- 2 tbsp freshly squeezed lemon juice
- 1/2 tsp Dijon mustard
- Pinch fine sea salt, to taste
- Freshly ground black pepper, to taste
- 2 tbsp very finely chopped mixed fresh herbs (parsley, dill, chives)
- Flaky sea salt, for finishing
- Extra lemon zest and chopped herbs, for garnish (optional)
- Lemon wedges, for serving
- Thinly sliced cucumber and radishes, chilled (optional, for serving)
- Toasted baguette slices or plain crackers (optional, for serving)
Step-by-Step Instructions
Step 1: Prep and Chill the Swordfish
Pat the swordfish dry with paper towels. If the piece tapers, trim off very thin ends and any dark bloodline so you are left with a fairly even block of fish. Aim for a piece you can shape into a cylinder about 2 to 2 1/2 inches (5–6 cm) in diameter.
For easier shaping and cleaner slices later, place the trimmed swordfish in the freezer for 10–15 minutes. You do not want it frozen, just slightly firmer and chilled all the way through.
Step 2: Season with Lemon and Herbs
In a small bowl, mix together the fine sea salt, black pepper, and granulated sugar. In a separate bowl, combine the lemon zest with the chopped parsley, dill, chives, and thyme (if using).
Sprinkle the salt-sugar-pepper mixture evenly over all sides of the swordfish, then gently press about half of the lemon-herb mixture onto the surface of the fish. Place on a plate, cover lightly, and refrigerate for 15–20 minutes. This brief rest seasons the fish and helps firm the texture without making it overly cured.
Step 3: Form a Tight Torchon
Tear off two long sheets of plastic wrap, each about 24 inches (60 cm) long, and lay them on your counter, overlapping lengthwise by about 3 inches (7 cm) to make a wider sheet. Lightly scatter a pinch of the remaining lemon-herb mixture in a strip down the center.
Lay the seasoned swordfish along that herb-lined strip. If needed, cut the fish into 2–3 long strips and nestle them side-by-side to form one continuous log. Starting from the edge closest to you, lift the plastic wrap up and over the fish and begin to roll it away from you, tightening as you go to create a firm cylinder. Once the fish is fully wrapped, grasp both ends of the plastic and twist them in opposite directions, like a candy wrapper, to compress the log even more.
Roll the torchon back and forth on the counter a few times, pulling on the ends, to make it as tight and round as possible. Tie each twisted end securely with kitchen twine. For extra insurance, wrap the whole log in a second layer of plastic wrap.
Optional but helpful: Wrap the torchon in a layer of aluminum foil or place it in a heavy-duty, well-sealed zip-top bag to make it fully water-safe. Refrigerate for 20–30 minutes to help it hold its shape before poaching.
Step 4: Prepare the Gentle Poaching Bath
In a wide, deep pot (large enough to hold the torchon with room around it), combine the water, white wine, sliced onion, smashed garlic, sliced lemon, bay leaf, peppercorns, and kosher salt. Set over medium heat and warm until the liquid reaches about 160°F (71°C).
Use an instant-read thermometer to check the temperature. At 160°F (71°C), the water will be steaming with just a few small bubbles rising to the surface but not actively simmering. Adjust the heat as needed to maintain this gentle temperature; a very low flame is usually enough once the water is warmed.
Step 5: Poach the Torchon at Low Temperature
Lower the wrapped swordfish torchon into the hot poaching liquid. It should be fully submerged; if not, add a bit more hot water. Place a small heatproof plate on top to keep it from floating, if needed.
Maintain the water temperature as close as possible to 160°F (71°C) and poach for 25–30 minutes. The fish will cook very gently inside its wrapping, staying moist and tender while becoming fully opaque and firm enough to slice. Avoid letting the water climb above 170°F (77°C); if it does, add a splash of cool water and adjust the heat.
Step 6: Chill Completely for Clean, Sashimi-Like Slices
Prepare a large bowl of ice water. When the poaching time is up, use tongs to transfer the torchon from the hot liquid directly into the ice bath. Let it cool there for 15–20 minutes, turning once or twice so it chills evenly.
Once cooled to the touch, remove the torchon, pat it dry, and refrigerate (still wrapped) for at least 2 hours, or ideally overnight. The longer chill time allows the fish to firm up into a smooth, sliceable cylinder with a texture similar to cold poached salmon or sashimi-grade tuna, but fully cooked.
Step 7: Make the Lemon-Herb Dressing
While the torchon chills, or shortly before serving, make the dressing. In a small bowl, whisk together the olive oil, lemon juice, and Dijon mustard until lightly emulsified. Season with a pinch of fine sea salt and a few grinds of black pepper.
Stir in the finely chopped mixed herbs. Taste and adjust: add more lemon juice for brightness, more salt for punch, or an extra spoonful of herbs for a greener, more aromatic flavor. Set aside at room temperature; whisk again briefly before using if it separates.
Step 8: Slice and Plate the Torchon
When you are ready to serve, unwrap the chilled swordfish torchon carefully and discard the plastic and twine. Trim a thin slice from each end to reveal a neat, even round.
Using a very sharp knife (a thin slicing or chef’s knife works best), cut the torchon into 1/2 inch (about 1.25 cm) thick rounds. For the cleanest cuts, wipe the blade with a damp cloth between slices.
Arrange the rounds slightly overlapping on a chilled platter or individual plates. Spoon a little of the lemon-herb dressing over and around the slices, letting some pool on the plate. Sprinkle lightly with flaky sea salt and a few extra chopped herbs or a touch of fresh lemon zest.
Serve with lemon wedges on the side, and, if you like, a nest of thinly sliced chilled cucumber and radishes and some toasted baguette slices or plain crackers. Serve well-chilled or just slightly cool.
Pro Tips
- Go for center-cut swordfish: A uniform, center-cut loin makes it much easier to roll a tidy, even cylinder that slices into attractive rounds.
- Plastic wrap tightness matters: The tighter you wrap and twist the ends, the smoother and firmer the interior texture will be. Do not be afraid to really pull on the ends as you roll.
- Keep the water temperature steady: A gentle 160°F (71°C) bath is key. Too hot and the fish can become dry and flaky; too cool and it may not set up as nicely.
- Chill thoroughly before slicing: Overnight chilling gives the very best texture and makes it much easier to get neat, round slices without crumbling.
- Slice with confidence: Use a long, very sharp knife and a smooth, single motion rather than sawing back and forth. Wiping the blade between cuts helps keep edges clean.
Variations
- Orange-Fennel Torchon: Swap half the lemon zest for orange zest and add 1 tsp lightly crushed fennel seeds to the seasoning mix. Garnish with shaved fennel and orange segments.
- Chili-Lemon Torchon: Add 1/4 to 1/2 tsp red pepper flakes or 1 finely minced fresh red chili to the herbs for a gentle heat. Finish with a drizzle of chili oil along with the lemon-herb dressing.
- Mediterranean Style: Stir 1 tbsp finely chopped capers and 1 tbsp minced pitted green olives into the dressing. Garnish the platter with cherry tomato halves and torn basil leaves.
Storage & Make-Ahead
The swordfish torchon is an excellent make-ahead dish. Once poached and fully chilled, keep it tightly wrapped in the refrigerator for up to 2 days before slicing. For best texture and flavor, slice shortly before serving. Leftover sliced torchon can be covered and refrigerated for up to 1 additional day; enjoy it cold in salads, on toast, or flaked into a light pasta. For food safety, do not freeze the finished torchon after cooking, as the texture will suffer and the wrapping may weep; start with fresh or properly frozen-and-thawed swordfish instead.
Nutrition (per serving)
Approximate values for 1 of 6 appetizer-sized servings (without bread or crackers): about 240 calories, 32 g protein, 11 g fat, 2 g carbohydrates, 0 g fiber, and 340 mg sodium. Actual values will vary based on the exact size of your swordfish portion, the amount of dressing used, and how much salt you add at the finish.
