Tekka Don

I had some left over Big Eye Tuna from an event I did Saturday and made sure I didn't waste it. 
I got home, sliced up the Tuna and marinaded in a homemade "Zuke" (Soy Sauce, Mirin, Dashi marinade) for 20 minutes, and layered it over a bed of rice and some other garnishing sides. 

Makes for a healthy and delicious meal.