Heat peanut oil in a frying pan to about 450°.
Place a thick Tuna steak (about 2 in thick) into hot oil for about 15 seconds. Flip to other side and cook for about 20 seconds.
Remove Tuna from pan and sprinkle with toasted white and black sesame seeds. Refrigerate.
Serve thin slices of the Tuna cold with teriyaki sauce, ginger, wasabi, and garnish.
Seaweed and Calamari Salads go great with this dish!