Cut tuna into very small cubes. Use a sharp knife for clean cuts.
Place in Bowl
Add chopped tuna to a chilled mixing bowl.
Add Olive Oil
Drizzle olive oil over the tuna gently.
Add Lemon Flavor
Add lemon juice and lemon zest. Mix lightly.
Add Seasonings
Add Dijon mustard, salt, and black pepper. Stir gently.
Add Shallots
Mix in finely chopped shallots and capers carefully.
Optional Sesame Oil
Add sesame oil if using. This adds soft nutty flavor.
Mix Gently
Mix everything slowly. Do not mash the tuna.
Shape and Serve
Use a ring mold or spoon onto plate. Garnish with chives.
Notes
Always use sushi-grade tuna only. Keep tuna very cold before cutting. Use a sharp knife for best texture. Do not overmix the tuna. Taste before serving and adjust salt. Serve immediately for best freshness.