Season the tuna with kosher salt and sesame seeds. Heat a large sauté pan or griddle on high heat. Add the olive oil and heat through. Once the olive oil and pan are heated, sear the tuna on each side for about 1 minute.
Remove the tuna to a cutting board and slice into 1” cubes. The tuna should be seared in the outside but mostly raw on the inside. Add to a bowl and toss with the soy sauce. Refrigerate until ready to serve.
In a deep-fryer or large cast-iron skillet over medium heat, add enough vegetable oil to fill about an inch up the pan. Heat oil to 350°F, then working a few wontons at a time, add to the skillet and fry on both sides, about 30 seconds total. Do not add to many at a time or it will crowd the pan.
Remove wontons to a paper towel-lined plate to drain. Continue until all the wontons have been fried. Add to a bowl and toss with the furikake and set aside.
In a small bowl, whisk the mayonnaise and wasabi paste together until throughly combined. Cover and refrigerate until ready to use.
Spread the wonton chips out on a large platter. Top with the shredded cabbage followed by the avocado and tuna. Drizzle with the wasabi mayonnaise and the sriracha then top with the cilantro, green onion and jalapeños. Serve immediately.