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Combine all ingredients except the sesame seeds into a re-sealable plastic bag and marinate for 30 minutes.
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Heat your grill to medium-high heat while you wait.
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After 30 minutes remove the steaks and discard the remaining bag of marinade.
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Sprinkle the 3 TBS of sesame seeds on a plate and roll the steaks around coating them evenly.
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Using a pair of tongs wipe the grill grates with a paper towel that's had a few TBS of vegetable oil applied.
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Grill steaks for 2-3 minutes per side being careful not to overcook the tuna or burn the seeds.
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Remove the steaks, slice, and enjoy.