Ingredients for 8 people
2 x 16 oz sheets all-butter puff pastry2 1/2 pound salmon fillet (2 smaller pieces will also work)
Mushroom filling:
8 oz mushrooms, finely chopped
1/2 cup sweet onion, finely chopped
3 cloves garlic
3 tbsp olive oil
1 tbsp lemon juice
salt and black pepper
1/4 cup parsley, finely chopped
2 tbsp sour cream
1 egg, beaten
Sauce:
2 tbsp sweet onion, finely chopped
3 tbsp butter
1 1/2 tbsp all-purpose flour
1 3/4 cups vegetable stock
6 oz frozen peas
6 oz watercress, chopped
6 tbsp sour cream
To make mushroom filling, heat 2 tbsp of the oil in a large pan. Add onion and fry, stirring occasionally, over medium heat for 3-4 mins to soften. Increase heat and add mushrooms. Fry until the liquid has evaporated, adding the garlic towards the end with a garlic press. Season lightly. Add lemon juice then parsley. Remove from heat and stir in sour cream.
Place one sheet of pastry on baking paper on a baking sheet. Lay one salmon fillet on top and trim pastry to fit, allowing 1/2 inch of pastry all round. Spread the mushroom filling over the salmon, then place the second fillet on top like a sandwich. Season lightly again. Cover with second pastry sheet, trimming as before - it will take more pastry for the 'lid' because the fish-mushroom filling is thick. Dampen edges of base sheet and press top sheet on firmly to prevent leaks. Crimp edges of parcel. Now take the discarded pastry strips and use them to make a crisis-cross design over the top. Brush the parcel with the beaten egg. Place in pre heated oven (425 F) and bake for 30 mins, covering with foil if pastry starts to brown. When the pie is done allow it to rest for 10 minutes before serving.
While the pie is cooking make the sauce - melt the butter in a pan, stir in the onion and and fry for a few minutes until soft but not colored. Stir in flour and cook 1 minute, then off the heat slowly add the stock. Return to heat and cook, stirring all the time until the sauce has thickened slightly. Add the peas. Simmer for 2 minutes. Remove from heat and stir in watercress. Purée the mixture in a food processor. Return to pan, stir in sour cream and mint, check seasoning and reheat gently just prior to serving.