Fisherman's Pie is much like the well-known Shepherd's Pie except that we use seafood instead of ground beef. It's layered with flaky white fish, mushrooms and shrimp, and topped with whipped potatoes. Adapted from Irish Pub Cooking.
While fish and potatoes cook, heat 1 tablespoon of butter in a large skillet over medium heat. Add mushrooms and cook until starting to soften, about 3 minutes. Add shrimp and cook until just pink, about 1-2 minutes, stirring to ensure they are evenly cooked. When ready, spread mushrooms and shrimp over cooked fish and return skillet to stovetop.