Place the egg in a small pot of boiling water for 6 minutes, then transfer to an ice bath, peel, and halve.
Pat the ahi tuna steak dry with a paper towel and season all sides with sea salt and black pepper.
Heat avocado oil in a cast-iron skillet over medium-high heat and sear the tuna for 1 minute per side until a golden crust forms.
Remove the tuna from the pan and let it rest for 2 minutes before slicing into thin strips.
In a small bowl, whisk together the coconut aminos, toasted sesame oil, and rice vinegar to create the dressing.
Combine the cooked brown rice and steamed cauliflower rice in a serving bowl to create a high-volume base.
Arrange the sliced tuna, soft-boiled egg halves, edamame, avocado, sliced cucumber, and sliced radishes over the base.
Drizzle the bowl with the prepared dressing and garnish with sesame seeds before serving.