Super easy, 10 minute recipe, 15 with a salad, a bit longer on rice.
Defrost the ahi tuna, pat dry with paper towel.
Coat the tuna with 1 tbsp soy sauce.
Mixture is
3 tbsp sesame seeds, and 1 tsp of each of : salt, pepper, granulated garlic, sugar, dried Italian seasoning (or thyme).
Sear 45-60 seconds, until golden, flip 60-ish until golden, hold upright on long edge with tongs until golden.
Cut and serve immediately.