Prepared portions of the trout season with salt and pepper. Pita bread cut into squares by the number of pieces of trout. On each square of a pita to put a piece of fish, herbs (tarragon, but in the absence I replaced cilantro) and topped with a piece of butter. Wrap envelope preheat the oven to 180 degrees. the envelopes with the fish lay on a baking tray lined with baking paper. Bake for 20 minutes.