Mary Cadogan's Lemon Meringue Cake

What better way to celebrate the season of promise than with some smart spins on old baking favourites, as well as some new friands?

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   1. Preheat the oven to 160C/140C fan/gas 21&#8260,2. Line the bases of 2 x 20cm sandwich cake tins (about 5cm deep) with nonstick paper. Grate the zest from the lemons and put in a bowl with the other cake ingredients. Beat together with an electric hand whisk for 2-3 minutes until light and fluffy. Spoon into the tins and level the tops.
   2. Whisk the egg whites until stiff, then gradually whisk in the sugar until the meringue is stiff. Spoon half the meringue over each cake and spread to within 2cm of the edges. Swirl the meringue with the tip of a knife.
   3. Bake the cakes for 35-40 minutes until the meringue is crisp and golden and the cake is firm. Test by inserting a fine skewer through the meringue – if just a few crumbs stick to the skewer, the cake is ready.
   4. Allow to cool in the tins for 10 minutes, then invert each cake on to a folded tea towel and then invert again on to a wire rack so the meringue is uppermost. (Alternatively, for loose-bottom tins, sit the tin on top of a can and gently push down the collar to free the cake.) Leave to cool completely. The cakes will keep for up to 2 days in a tin at this stage.
   5. Beat together the mascarpone and sugar. Put spoonfuls of lemon curd over the mascarpone and swirl gently together. Set one cake on a serving plate and spread with the filling. Top with the other cake and dust lightly with icing sugar.