Baked Dory fish with mushroom and lemon sauce

I saw this recipe from Dad - Baker & Chef blogspot. I thought I'd give it a try and the sauce was very nice.

Recipe:

4 large Dory Fillets (about 1.5 kg)
3 cloves garlic - chopped finely
250g Button Mushrooms - quartered
1 tsp oregano
1 tsp rosemary
2 tbsp flour
1 tbsp butter
200 ml Milk
4 bay leaves
Juice from half a lemon
Salt
Black Pepper
Olive Oil

Direction:

Wash fish and cut into large pieces. Place on baking tray lined with aluminium foil. Make sure there is sufficient foil to cover the fish too.

In a small pan, Fry garlic together with oregano and rosemary with olive oil. Add in black pepper. Stir fry mushrooms till slightly soft. Remove from pan. Add in a little more oil and butter. Stir in the flour and cook until golden. Add in milk and cooked mushrooms. Add in lemon juice and mix well. Season with salt and pepper. Simmer until mixture thickens. Meanwhile, season Dory fillets with salt and pepper. Rub some of the lemon juice on to the fillets. Place bay leaves around fish and then pour the mushroom mixture over fish. Spread the sauce evenly. Fold over the aluminium foil to cover sides and top. Bake in 200C oven for about 30 minutes.

Oil and juices from the fish while cooking will dilute the sauce, so ensure that your sauce is thick enough before cooking the fish in the oven.