This is one of those embarrassing recipes that you eat at someone else's house, really enjoy, ask for the recipe and then confirm that you are a complete food snob because you are appalled by "the secret ingredient". My sister first served me fish broiled this way and I enjoyed the dish - it was very flavorful and, for broiled fish especially, incredibly moist. It is apparently the addition of Hellman's mayonnaise to the topping that makes the dish.
So, here is a 10 minute fish recipe that people will praise to the skies until you tell them about the Hellman's. Then they start to look at your previously lauded cooking skills with slightly more sceptical eyes. I served the turbot with steamed cabbage wedges because I had 3/4 of a honking head of the stuff taking up valuable fridge real estate after making spring rolls last week, but I would recommend serving the fish with green beans or spinach, any vegetable that can bring some color to the plate.
Recipe
4 turbot filets
2 Tbsps Hellman's mayonnaise
1 Tbsp Dijon mustard
1/2 cup grated Parmesan
2 Tbsps finely chopped spring onion
Preheat oven to 350.
Mix all ingredients except for the turbot together to form a paste. Spread on top of the fish filets.
Bake for 10 - 12 minutes, depending on the size of the filets.
Turn on the broiler. Broil the fish until the topping is golden brown, about 4-6 minutes but may vary further dependent on how close to the broiler your fish filets are and how hot your broiler actually gets.