Pre-heat the oven to gas mark 4, 180ºC.

Place the egg yolks, grated rind and juice of the lemons, the sugar, butter and flour into the food processor and blend together. Add the milk through the feeder tube.

Beat the egg whites until firm and fold into the liquid. Pour into a 1.4 litre (2½pt) greased ovenproof dish. Cook in a bain marie in the pre heated oven for 30-40 minutes.

To make by hand: rub the butter into the flour. Add the sugar and yolks, blend with a little of the milk until smooth then add the remaining milk, the lemon rind and juice. Continue as before.

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