Inside the light suet pastry is a whole lemon, sugar and butter which, when the pudding is cut into, causes a flood of lemony juices to rush out to form a pond of sauce.
Prepare a 1litre pudding basin for steaming (see Chef’s techniques).
To make the filling, place the butter and sugars in a bowl and, using a wooden spoon or electric beaters, beat together until soft and pale. Prick the lemo