Mackeral and Spinach pie with crushed new potatoes

You can always find Mackerel wearing a reduced sticker and it is one of the most underestimated and tastiest fish in our Supermarket. It is also very versatile and many a dish can be made with it. I previously made a smoked mackerel pate that was not only simple but it went down a treat. This fish pie is not the quickest meals but it is quite healthy with the spinach and I have left the skins on the new potatoes as this makes them richer in nutrients which are better for your health.