Pat the tuna dry with a paper towel and season all sides with sea salt, black pepper, and sesame seeds.
Heat the sesame oil in a cast-iron skillet over medium-high heat until it begins to shimmer.
Place the tuna in the skillet and sear for 90 seconds per side for a rare center, then remove and let rest.
In a small glass jar, whisk together the coconut aminos, lime juice, and grated fresh ginger to create the dressing.
Slice the rested tuna into thin strips against the grain using a sharp knife.
Place the cooked quinoa in the base of a bowl and arrange the tuna, avocado, edamame, and cucumber on top.
Drizzle the ginger-lime dressing over the entire bowl and serve immediately.