This is such an elegant and flavorful way to prepare fish. This is from my recipe file of "How to Win a Husband 101". A co-worker shared this recipe and warned me it would "Wow" even those that didn't like fish. I prepared this elegant dish when I was dating my husband. He was really impressed and 13 years later, he still loves this dish. The resulting preparation does not have a strong fish flavor and the combination Mornay like sauce served over a bed of spinach tastes like a restaurant quality dish. I included a shrimp sauce option at the end of the recipe.