Preheat the oven to 180 degrees Celsius /356 degrees Fahrenheit / Gas 4.
Using either a food processor or manual labour of whisking, beat the butter, sugar and lemon zest together until pale. Beat in the egg yolks, one at a time.
Add the flour and milk alternately until you have a smooth batter, beating well. Lastly, beat in the lemon juice.
In a large bowl, beat the egg whites until firm but not stiff, and fold the two mixtures together.
Pour into a buttered 1 litre ovenproof dish and place in a baking tin.
Half-fill the tin with hot water and bake for 50 minutes or until the pudding is lightly browned and set on top, with a soft base of gooey lemon curd.
Remove the dish from the water, dust the pudding with icing sugar and serve immediately.
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