Place hake fillets on a lined baking tray. Lightly brush with olive oil and season with salt and pepper to taste. Bake for 15-20 minutes or until fully cooked through.
Allow to cool slightly before removing any bits of skin. Lightly flake the cooked fillets into a large bowl and set aside to cool completely.
For the mushrooms
Using a food processor, pulse the mushrooms until they are finely chopped.
In a large saucepan heat a drizzle of olive oil and add the mushrooms.Sauté until the mushrooms give off all their water and begin to brown. Remove from the heat and allow to cool.
Add the cooled mushrooms to the flaked fish along with the rest of the ingredients. Season and mix well.
Roll into balls about the size of a golf ball. Place on a lined baking tray and bake for 25 min.
Serving
Serve fish balls with mayonnaise or your favourite dipping sauce.