Directions:

- Generously butter an 850 ml pudding basin.

- Stir together the juice of 1 lemon and the brown sugar until the sugar dissolves, then tip it into the basin.

- Cream together the butter, lemon zest and caster sugar until very light and fluffy. Beat in one egg at a time, adding a spoonful of flour with each, then fold in the remaining flour. Finally stir in the rest of the lemon juice. Spoon the mixture into the basin. The lemon juice and sugar mixture will rise up the side of the basin – don’t worry about this, and don’t attempt to stir it in with the batter.

- Tie a double layer of buttered foil or baking parchment, buttered side down, over the top of the basin. Put a trivet, rack or upturned small heatproof plate in a large saucepan and stand the pudding on it. Pour
in boiling water to come about halfway up the side of the basin, then cover the pan and bring to a very gentle simmer. Steam for 2 hours, topping up the boiling water a couple of times along the way.

- Remove the foil and loosen the edges of the pudding with a knife. Place a plate on top, then invert the plate and basin and unmould the pudding. Enjoy the moment as the sauce trickles down the sponge like hot lava, and let your guests admire it, too. Then slice or divvy up with a large spoon and serve piping hot, with chilled double cream.