Pat the sushi-grade ahi tuna dry with a paper towel and cut into uniform 1/2-inch cubes.
In a small glass bowl, whisk together the coconut aminos, sesame oil, finely grated fresh ginger, and sea salt.
Add the tuna cubes to the marinade, tossing gently to coat, and let them marinate in the refrigerator for 10 to 15 minutes.
Steam the cauliflower rice in a covered pan with a splash of water for 3 to 5 minutes until tender then transfer to a serving bowl.
Thinly slice the cucumber and radishes into rounds, and dice the avocado into small chunks.
Arrange the marinated tuna, edamame, cucumber, radishes, and avocado in sections over the cauliflower rice base.
Thinly slice the green onion and sprinkle it over the bowl along with the sesame seeds for a final crunch.