Whisk the salad dressing ingredients together and set aside.
Sprinkle a flat plate with sesame seeds, garlic powder, salt, and pepper. Mix with your finger until well combined.
Place ahi steak on a second plate and drizzle with soy sauce on both sides, rubbing into the flesh to get an even coat. Press the steak into the sesame seeds, making sure to coat both sides well.
Get a skillet or heavy bottom pan nice and hot on super high heat and turn your vent fan on. Prep everything, as we'll be moving quickly here--grab a splatter screen, and place a clean plate and tongs next to your stove. Once the pan is super hot add your oil, and once that starts to smoke, add the ahi. Place the splatter guard on top. Sear on each side until golden and the ahi lifts off the pan easily, should be 45 seconds to 1 min.
Use tongs to hold the ahi upright, and rotate to sear each edge.
Place cooked ahi on a cutting board and allow it to cool for 10 minutes before slicing. Then slice using a sharp knife into small pieces.
While the ahi rests, toss your salad ingredients together, except the avocado. Drizzle with dressing and toss again. Plate the salad on 4 plates, and top with sliced avocado and ahi. Enjoy!