Seared Tuna with Lemon Caper Sauce

✓ Monash FODMAP · Phase 1 Compliant

Fifteen minutes, two pans, restaurant results. The tuna is the easy part — the hard part is leaving it alone. A searingly hot pan, completely dry fish, and the discipline to pull it while the center is still pink are the only techniques required. The lemon caper sauce builds in a separate small pan while the tuna rests: capers provide brine, lemon provides acid, garlic-infused oil provides depth. Every drop of the pan drippings from the sear belongs in that sauce.

Recipe Info

• Yield: 2 servings
• Serving size: 1 tuna steak with sauce
• Prep time: 5 minutes
• Cook time: 10 minutes
• Total time: 15 minutes

Equipment

• Heavy skillet or cast iron pan
• Small saucepan
• Microplane or fine grater
• Tongs
• Instant-read thermometer (optional — 110–115°F for rare, 125°F for medium-rare)

Ingredients

• 2 tuna steaks, 1 inch thick (6–8 oz each), patted completely dry
• 1/2 teaspoon sea salt
• 1/4 teaspoon black pepper, freshly ground
• 2 tablespoons garlic-infused oil (for searing)
• 1 fresh lemon — zested first, then juiced (about 2 tablespoons juice)
• 1 1/2 tablespoons large capers, roughly chopped
• 1 teaspoon caper brine, from the jar
• 1/2 teaspoon pure maple syrup
• 1 tablespoon olive oil
• 2 tablespoons garlic-infused oil (for the sauce)
• 1/4 teaspoon black pepper (for the sauce)

Method

1. Zest the lemon first, then juice it — set zest and juice aside separately. Roughly chop the capers.
2. Pat tuna steaks completely dry. Season both sides with salt, pepper, and a pinch of the lemon zest rubbed lightly into the surface.
3. Heat a heavy skillet over high heat until smoking — the pan must be very hot before the fish goes in. Add 2 tablespoons garlic-infused oil. Place tuna in the pan and do not touch it. Sear for 90 seconds per side for rare, 2 minutes per side for medium-rare. Remove immediately to a plate and rest for 2 minutes.
4. While the tuna rests, heat 2 tablespoons garlic-infused oil in a small saucepan over medium heat. Add the chopped capers and caper brine — let them sizzle for 30 seconds until the brine begins to reduce.
5. Add the lemon juice, maple syrup, olive oil, and black pepper. Stir and let bubble gently for 1 minute until the sauce is cohesive and slightly glossy.
6. Remove from heat. Stir in the remaining lemon zest — adding it off the heat preserves the fragrant oils that make fresh zest worth using.

To Serve

Plate the tuna over white rice. Spoon the lemon caper sauce generously over the fish. Finish with a squeeze of any remaining lemon. Serve immediately.

Storage

Best eaten fresh. Tuna does not reheat well — plan portions accordingly.

Chef’s Note

Tuna overcooks in seconds. A 1-inch steak needs no more than 2 minutes per side for medium-rare — the center should be warm and pink. Grey tuna is dry and unpleasant. When in doubt, always pull it early. The pan drippings from the sear can be deglazed with a splash of lemon juice and stirred into the sauce for extra depth.