Cooking with the Dutchess: By Hanneke Eerden &nbsp;&nbsp; Today on the menu: spinach gratin! First, I love gratins, probably because I like cheese and cream, and second because you can vary with lots of ingredients. This time I&rsquo;ve choosen for spinach. It&rsquo;s a great side dish for steak, pork or even fish! &nbsp;&nbsp; Spinach is [...]