Preheat oven to 375 degrees. Pour enough melted butter in the bottom of a casserole dish to coat the bottom. Pour off excess and save extra
butter on the side. Sprinkle minced shallots or diced onions over butter in casserole dish. Cut halibut into bite size pieces and arrange in casserole on top of onions or shallots. Season
halibut with white wine and lemon juice. Spread mayonnaise on top of halibut using a rubber scraper to spread evenly. Combine bread crumbs with reserved excess melted butter and sprinkle
on top of mayonnaise. Bake for 15 to 20 minutes until top is golden brown and halibut is cooked in center (It will flake easily with a fork). Drain excess butter and serve halibut olympia
garnished with a sprinkle of parsley or paprika on top.