Combine the yellow and black sesame seeds in a shallow plate, dredge and press both sides of the tuna steaks (or kabobs) into the seeds. They should stick naturally.
Heat the vegetable oil in a medium skillet over medium heat. Add the tuna, searing on both sides for approximately 2-4 minutes. This greatly depends on the thickness of your tuna and desired degree of doneness. Use an instant digital thermometer for best results. Rare is 110-155°F, medium-rare is 120-130°F, 135°F is medium, 140°F is medium well and we do not recommend going to well done which is 145°F.
Remove the tuna from the skillet and allow to rest for 3-4 minutes before serving.
Wasabi Cream Sauce:
IN a medium mixing bowl using an electric hand mixer with whip attachments or in a stand mixer fitted with the whisk attachment, whip the heavy whipping cream until it is stiff and bodied, approximately 3-4 minutes. Add the wasabi powder and salt, continuing to whip until combined. Do not over mix. Chill until ready to use.
Plate with tuna and a hefty dollop of wasabi cream sauce on top or the on the side for dipping.
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