Do you eat fish often? In the Basque Country fish is a must, people and kids love it, and will eat it every single night if possible. At night most of the time because it makes the perfect dinner, it is very light an necessarily healthy.
First cut the head off, all of it, with a big and heavy knife so you can easily cut the bone. Don´t keep it, trouts are not good to make stock.
Let it cook in the oven until the fish turns white and opaque, less than 10 minutes in medium oven, then it is ready to eat, so delicious and so easy.
Don´t serve it with any more than the onions they are cooked, a piece of bread and a glass of wine.
Enjoy and if you like, you still have some calorie credit to get dessert!.