In small bowl, combine mayonnaise, yogurt, wasabi paste and ginger; mix until well combined. Set aside.
Roll tuna slices in sesame seeds. Heat oil in medium skillet over high heat. Sear tuna slices for about 30 seconds per side. Remove to paper towels to drain.
Slice crosswise into thin pieces. Place cucumber slices on crackers, top with a dollop of wasabi sauce and then a slice of tuna.
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