Preheat the oven to 220C. Season the beef with
pepper, then tie it at intervals with string.
Heat the butter and oil in a roasting tin. Brown the
beef over a high heat, then cook in the oven for 20
minutes. Cool and remove the string.
Scrape the cooking juices into a pan, add the onion
and mushrooms and cook until tender. Cool, then mix
with the pate. Add lemon juice and Worcestershire
sauce.
Roll out the pastry to a large 5mm thick rectangle.
Spread the pate mixture on the beef, then place it
in the centre of the pastry. Dampen the edges of the
pastry, then fold it over the beef to make a neat
parcel, tucking in the ends neatly; press to seal.
Place the parcel on a baking sheet with the join on
the underside and brush with beaten egg. Bake in the
oven for 25-45 minutes, depending how well done you
like the beef. Serve in generous slices.