Tuna Gravlax with Radish and Avocado Salad

Tuna bellies, or toro, are prized in sushi bars for their velvety texture. That said, you can also use tuna loin in this recipe; it will simply be a little lean. Make sure that your knife is very sharp--it's the key to slicing through the soft fish easily without tearing it.
How to Make It
Combine 2 tbsp. salt and the sugar in a small bowl. Rub both sides of tuna belly with salt mixture. Set on a plate, cover, and chill at least 6 hours and up to overnight.
Briefly rinse fish with cold water and pat dry with paper towels. Using a very sharp knife, thinly slice belly diagonally across the grain, pulling the knife through the fish rather than sawing. Divide slices among 4 to 6 small salad plates, spreading them out in a single layer. Cover each with plastic wrap and, using the bottom of a liquid measuring cup, gently pound fish into a thin layer.
Thinly slice radishes, then cut into thin matchsticks. Transfer to a small bowl and add avocado, chives, oil, and lemon juice. Season with remaining 1/2 tsp. salt and toss until well combined. Spoon some salad onto each plate.
Ingredients
Directions
Combine 2 tbsp. salt and the sugar in a small bowl. Rub both sides of tuna belly with salt mixture. Set on a plate, cover, and chill at least 6 hours and up to overnight.
Briefly rinse fish with cold water and pat dry with paper towels. Using a very sharp knife, thinly slice belly diagonally across the grain, pulling the knife through the fish rather than sawing. Divide slices among 4 to 6 small salad plates, spreading them out in a single layer. Cover each with plastic wrap and, using the bottom of a liquid measuring cup, gently pound fish into a thin layer.
Thinly slice radishes, then cut into thin matchsticks. Transfer to a small bowl and add avocado, chives, oil, and lemon juice. Season with remaining 1/2 tsp. salt and toss until well combined. Spoon some salad onto each plate.