This is hte one I use, it's for a 3lb fillet roughly!
1tsp oil
1.5oz butter
8oz mushrooms finely chopped ( I use a mixture of different ones)
8oz smooth pate
1 small onion
2 tbsp horshradish sauce
1lbish of puff pastry
beaten egg to glaze
Brown the fillet in the oil in a frying pan, then transfer to a hot oven and roast for 20mins and cool.
Fry onion slowly in butter, add finely chopped mushrooms. Leave to cool then mix with the pate and horshradish.
Roll out the pastry to fit the joint (13" by 11" as a starting point).
Put the pate/mushroom mixture down the middle of the pastry, leaving a wide border at each side. Season the meat and then place it on the middle and fold the pastry over hte meat, shape, then turnover so the join is underneath and decorate appropriately.
Glaze with egg.
Bake in 220c oven for 50mins (last 25 mins of cooking time should cover with foil).