When I do not know what to do for dinner, I use leftover cooked rice saved in the freezer.
One simple meal is leftover rice topped with hot water and packaged Nagatanien - Nori Chazuke (rice soup seaweed seasoning) 0.85 Oz.
I buy my Japanese items and fish locally at Seafood at West Main in Charlottesville, Virginia.
All of my girls love this dish.