PREPARATION:

For the burgers:

1. Combine diced tuna and seasoning blend in a bowl and mix gently but thoroughly to combine. Divide mixture into 4 even portions and pat each portion into a flattened patty.
2. Preheat griddle to medium high. Cook tuna burger for 1-2 minutes per side for medium rare.
3. Alternatively, preheat a broiler to 500 degrees F and position an oven rack about 6 inches from the broiler unit.
4. Line a baking sheet with aluminum foil and position an ovenproof rack on top of the baking sheet. Place the burgers on the rack and broil until just cooked through, 6 to 7 minutes.
5. Remove and serve burgers on buns garnished with desired condiments.

6. Learn more about sustainable food choices with our Eat Green Guide.

7. Check out the Episode Guide here!

For the soy mayo:

1. In a very small saucepan combine the remaining soy sauce and the sugar and cook until reduced to a syrup, 2 to 3 minutes. The soy-sugar mixture should coat the back of a spoon. Set aside to cool completely. When cooled, add 1 1/2 tablespoons of the soy glaze to the mayonnaise and refrigerate until ready to serve the burgers. (The remaining soy glaze may be kept indefinitely at room temperature and used to drizzle on grilled salmon or grilled tuna.)

   Editor's Note: Consult Treehugger's Best of Green Winner Monterey Bay Aquarium's Endangered Seafood Guide whenever making seafood choices.