Preheat the oven
to 160.C/325'F/Gas 3. Grease a 20cm/8in springform
tin. Place on a 30cm/12in circle of foil. Press it
up the sides to seal tightly. Press the crushed
biscuits into the base of the tin.
Beat the cream
cheese until smooth. Add the sugar, lemon rind and
juice, and vanilla, and beat until blended. Beat in
the eggs, one at a time.
Pour into the
prepared tin. Set the tin in a larger baking tray
and place in the oven. Pour enough hot water in the
outer tray to come 2.5cm up the side of the tin.
Bake until the
top is golden brown, about 1'h hours. Cool in the
tin.
Run a knife
around the edge to loosen, then remove the rim of
the tin. Chill for at least 4 hours before serving.