rub thawed ago tuna with salt,pepper,1/4 cup olive oil, thyme and tarragon. press sesame seeds on each side. put garlic, shallots and 2 Tbsp olive oil in saute pan and heat on high until oil bubbles. carefully place fish in the pan and seat about 15 seconds on each side for rare. 30 seconds for medium and for well done start at low heat and saute about 10 minutes