Cook the brown rice according to package instructions until tender, then set aside to keep warm.
Using a sharp knife, cube the sushi-grade ahi tuna into uniform half-inch pieces.
In a small glass bowl, whisk together the coconut aminos, toasted sesame oil, and freshly grated ginger.
Gently fold the tuna cubes into the marinade and let them sit for 5 minutes in the refrigerator to absorb the flavors.
Prepare the toppings by dicing the mango, slicing the cucumber, and thinly slicing the avocado.
Assemble the bowl by placing the warm brown rice at the base.
Arrange the marinated tuna, shelled edamame, mango, cucumber, and avocado over the rice.
Garnish with toasted sesame seeds, sliced green onions, and a light sprinkle of sea salt before serving.