Rinse the fish under running water, sprinkle with salt, and leave to drain for 5 minutes. Marinate for 1 hour.
Heat the tile or dish in a hot oven for 10 minutes. When it is cool enough to handle brush with half the butter, line it with a cabbage leaf or two and place the fish on it. Brush the remaining butter on the fish, and enclose it completely in cabbage leaves. Bake in a preheated