Here's my recipe. Cook (boil) some buckwheat to 90% readiness. Layer the buckwheat, mahi-mahi and tomato slices in a lasagna pan, so that the buckwheat covers everything on top and bottom. Put cream cheese slices and some dill branches on top. Loosely cover the pan with tinfoil and bake on medium-low (I'd say ~400-450F) in the oven for about 20 minutes. Then, remove the tinfoil and keep baking it until ready or cream cheese turns light brown and crispy. I'm not sure about the cooking times, I usually judge the readiness visually. In any case, it's rather hard to spoil this dish and it comes out nicely.