Equipment
Ingredients
Balsamic Glaze
- 60 ml balsamic vinegar
- 15 ml soy sauce
- 15 ml honey
Tuna
- 400 g yellowfin or ahi tuna steaks, sushi-grade, two steaks about 2.5cm thick
- 3 g kosher salt
- 1 g black pepper, freshly ground
- 15 g white sesame seeds
- 15 g black sesame seeds
- 15 ml avocado oil
Nutrition (per serving)
Method
Combine the balsamic vinegar, soy sauce, and honey in a small saucepan over medium heat, stirring until the honey is dissolved.
Simmer the glaze mixture for 5 to 7 minutes until it thickens into a syrupy consistency that heavily coats the back of a spoon. Remove from heat and set aside.
Thoroughly pat the tuna steaks dry with paper towels to remove all surface moisture, which ensures a proper sear. Season both sides evenly with kosher salt and black pepper.
Mix the white and black sesame seeds in a shallow dish. Firmly press the top and bottom of each seasoned tuna steak into the seeds to create an even, dense crust.
Heat the avocado oil in a cast iron skillet over high heat until it just begins to smoke. Carefully place the tuna steaks in the pan and sear for 60 to 90 seconds per side. Target an internal temperature of 46 degrees Celsius or 115 degrees Fahrenheit for a rare center.
Use tongs to transfer the seared tuna to a clean cutting board. Let the fish rest undisturbed for 2 minutes to allow the juices to settle.
Using a very sharp chef's knife, slice the rested tuna across the grain into pieces that are about 1 centimeter thick.
Arrange the sliced tuna on serving plates and generously drizzle the warm, reduced balsamic glaze over the top.
Chef's Notes
- Using a high smoke point oil like avocado or grapeseed is essential for a hard sear without burning the fat before the fish is properly crusted.
- Always use sushi-grade or sashimi-grade tuna for this preparation, as the center remains effectively raw. Consuming undercooked seafood carries inherent risks, so source your fish from a highly reputable fishmonger.
- A freshly honed, sharp knife is crucial for slicing the crusted tuna. A dull blade will tear the delicate flesh and crush the beautiful sesame crust you worked hard to build.
- If you prefer a medium-rare or medium doneness, increase the searing time to 2 minutes per side, but be aware that yellowfin and ahi tuna tend to become dry if cooked past medium-rare.
Storage
Refrigerator: 1 day — Store in an airtight container.
Reheating: Do not reheat to avoid overcooking the tuna. Serve any leftovers chilled over a fresh green salad.
