Her is a easy one I used at a catering company. Small to medium dice tuna Right before service fold in some argan oil, red salt, bias cut scallions, then drizzle with some ponzu sauce. I don't have any amounts it's done to taste. Here is a link for argan oil http://stores.mustaphas.com/Detail.bok?no=2 For the ponzu • 3 x 2 1/2 in. (8x6 cm) dried kelp (konbu) • 1 3/4 cups (450ml) musk lime (ponzu or kala-mansi) juice, or lemon juice • 1 3/4 cups (450ml) dark soy sauce • 1/3 cup (90ml) mirin • 1/4 cup (70ml) tamari soy sauce • 4 cups (40g) dried bonito flakes Bring the liquids to a simmer, then add the bonito. When the flakes sink strain and cool