Rinse the jasmine rice under cold water until clear, then combine with water and half the grated ginger in a small pot.
Bring the rice to a boil, reduce to a simmer, cover, and cook for 15 minutes or until the water is absorbed and the rice is fluffy.
Pat the tuna steak dry with paper towels and season both sides evenly with sea salt and black pepper.
Heat the avocado oil in a cast-iron skillet over medium-high heat until shimmering.
Sear the tuna for 1 to 2 minutes per side for a perfect medium-rare center, then remove from the pan and let rest.
In the same skillet, add the toasted sesame oil along with the minced garlic, remaining ginger, julienned carrots, and chopped bok choy.
Sauté the vegetables for 3 to 4 minutes until they are crisp-tender and vibrant.
Stir in the tamari to glaze the vegetables and remove from heat.
Slice the tuna against the grain and serve it over a bed of ginger rice and vegetables, garnished with sesame seeds.