Remove the fillet from the pan, add the zest and remaining broth (it may take a little more or less broth than indicated in the recipe, be guided by the amount of sauce you need). For sure, after marinating the fish, you have a little marinade left in the bowl, add it to the sauce. At this stage, the chef adds a couple of pinches of flour to thicken the sauce. I replace the flour with yogurt, which gives the sauce a delicate texture and fresh taste. The choice is yours. Boil the sauce for a couple of minutes, if necessary, adjust the salt. Return the fish to the pan, turn out the heat, cover and let stand for 10 minutes.
Serve fish chef advises with vegetables, watering it with sauce and onions, but any side dish is perfect.