Whisk together all of the ingredients for the marinade in a bowl (everything except the tuna) and stir until well combined (Note: you can also blend the marinade in a small blender).
Place the chopped ahi in the bowl with the marinade and stir. Serve immediately, or cover and refrigerate until ready to serve.
Notes
*Replace sesame oil with olive oil if desired**Replace coconut aminos with liquid aminos, or with low-sodium soy sauce if desired