I made this twice, it was a hit but i tweaked it as follows. I used Cod, I sliced the potatoes thinner, cooked them with the scallions on top, then after about 20 mins i added the fish on top (same dish) then cooked until fish was done. It was delicious!! The potatoes need the time to cook and they absorb the flavor of the fish, oh and i placed lemon slices on top of the potatoes and scallions between them and the fish. A terrific quick, healthy dinner.