Pat the tuna dry with a paper towel and season both sides with sea salt and black pepper.
In a small bowl, whisk together the coconut aminos, wasabi paste, rice vinegar, and sesame oil until smooth.
Heat a non-stick skillet over medium-high heat with the avocado oil until shimmering.
Sear the tuna for 60-90 seconds per side for a rare center, then remove from the pan and let rest.
In the same pan, quickly sauté the cauliflower rice and edamame for 3 minutes until tender.
Slice the tuna into thin strips and serve over the cauliflower rice base.
Top with sliced avocado, cucumber, radishes, and green onion, then drizzle with the wasabi sauce and garnish with sesame seeds.