Preheat the oven to 180°C/Fan 160°C/Gas 4. Lightly butter a 1.5 litre ovenproof dish.
Using an electric hand mixer, or free-standing mixer, beat together the butter and sugar until light, pale and fluffy, about 5 minutes, scraping the bowl down with a spatula a couple of times.
Beat in the egg yolks and lemon zest, then sift the flour and baking powder together over the batter and lightly fold in.
Whisk together the yoghurt and lemon juice, then gently stir this mixture into the batter until just combined.
Whisk the egg whites in a scrupulously clean bowl until they form soft peaks then gently fold into the lemon mixture, using a metal spoon.
Spoon the mixture into the prepared dish. Stand the dish in a roasting tin and carefully pour in boiling water from the kettle to come halfway up the sides of the dish. Bake for about 50 minutes until the pudding is puffed up and lightly golden on the top – it should still have a slightly tender wobble to it.
Carefully remove from the oven, then lift the pudding out of the roasting tin. Leave to stand for 5 minutes before serving.
Dust with icing sugar to serve. Hand round a jug of double cream or a bowl of thick fresh yoghurt for everyone to help themselves.
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