Cut the puff pastry into 6 squares. Using a
small sharp knife, score another square 1 cmN2in
in from the edge of each to make a frame.
Put
the squares on a greased baking tray. Beat 1 egg
lightly and brush over each pastry case. Bake
for 10 minutes or until well risen and slightly
golden.
Scoop out the pastry from the inner square,
leaving a thin layer at the bottom.
Melt the butter in a frying pan, add the leeks
and cook until soft. Beat the remaining egg and
add it to the leeks along with the chives.
Fill each pastry case with the leek mixture. Top
with a slice of Roquefort and sprinkle with
walnuts. Return to the oven and bake for 10 to
15 minutes or until golden and heated
thoroughly. Serve warm.