Preheat the oven
to 160'C/325"F/Gas 3, Base line and grease a
20cm/8in cake tin.
Sift the
flour and baking powder into a bowl. Set the
mixture aside.
Cream the butter
or margarine, adding the caster sugar about 30mI/2
tbsp at a time, until light and fluffy. Stir in the
lemon rind and vanilla. Add the eggs one at a time,
beating for 1 minute after each addition. Add the
flour mixture and stir until just combined.
Pour the cake
mixture into the prepared tin and tap lightly to
level. Bake for about 1 1/4
hours, or until a metal skewer inserted in the
centre comes out clean.
Cool in the tin
on a wire rack for 10 minutes, then turn the cake
out onto a wire rack and leave to cool completely