Tuna Tartare
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1 pound sushi grade tuna, finely diced
3 tablespoons olive oil
1/4 teaspoon wasabi powder
1 tablespoon sesame seeds
1/8 teaspoon cracked black pepper

In a bowl, stir together olive oil, wasabi powder, sesame seeds, and 
cracked black pepper. Toss tuna into mixture until evenly coated. Adjust 
seasoning as desired with additional wasabi powder or black pepper.

From: allrecipes.com