Pat the ahi tuna dry with a paper towel and cut into 1/2-inch cubes.
In a small bowl, whisk together the coconut aminos, lime juice, grated ginger, toasted sesame oil, sea salt, and black pepper.
Toss the tuna cubes in the marinade and let sit in the refrigerator for 10 minutes to absorb the flavors.
Lightly steam or sauté the cauliflower rice until tender, then place it at the base of your serving bowl.
Slice the cucumber, radishes, and green onion, and dice the avocado.
Arrange the marinated tuna, edamame, cucumber, radishes, and avocado over the cauliflower rice.
Garnish with sliced green onions and crushed macadamia nuts for a satisfying crunch.