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Mix together ingredients 2 through 5 to make a marinade.
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Marinate the tuna steaks for at least 10 minutes (I tend to buy sashimi grade tuna medallions/steaks).
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Pour the two oils into a frying pan, preferably non-stick or anodized, and heat over low-medium flame.
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Place the tuna steaks in the hot oil.
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Pour one teaspoon corn starch onto each tuna steak, then one teaspoon sesame seeds and half the fresh ground black pepper.
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After about 4 minutes, flip the steak over. Cover the other side with 1 teaspoon sesame seeds and the rest of the fresh ground black pepper.
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Cook for another 3-4 minutes.
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Flip the tuna steak over one last time for about 1 min to toast the sesame seeds.
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Let rest for a few minutes before slicing and serving.