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Heat the oven to 180C/160C fan/gas 4 and line the base of two 20cm sandwich tins with baking parchment. Beat the butter and sugar together for 3 mins using an electric whisk until smooth and fluffy. Add the eggs, one at a time, beating well between each addition and scraping down the sides of the bowl. Fold in the flour and baking powder until well incorporated, then fold in the yogurt, vanilla and lemon zest. Divide between the tins and bake for 30-35 mins until golden and a skewer inserted into the middles comes out clean.
Meanwhile, make the drizzle. Tip the sugar, lemon juice and 100ml water into a small pan set over a medium heat and stir until dissolved. Add the lemon zest, bring to the boil and simmer for 2-3 mins until the zest has softened and the liquid is syrupy. Remove the zest to a sheet of baking parchment using a slotted spoon, and remove the syrup from the heat.
Leave the sponges to cool for 10 mins in the tins, then pour over the warm drizzle. Leave to cool completely.
For the icing, beat the butter and icing sugar together using an electric whisk for 4-5 mins until smooth, scraping down the sides of the bowl as you go. Add the vanilla and soft cheese and beat for 4 mins more until thick and creamy. Don’t worry if it doesn’t look thick at first – it will loosen, then thicken again as you beat it.
Remove the cooled sponges from the tins. Spoon the icing into a piping bag fitted with a star nozzle. Put one sponge on a cake stand or serving plate, and pipe just under half the icing around the edge using a circular motion for a wavy effect. Pipe a little more icing over the empty middle (this doesn’t need to be neat) and smooth with the back of a spoon. Chill for 45 mins-1 hr until set. Top with the second sponge, then pipe eight blobs of icing around the edge at regular intervals, leaving a gap between each. Spoon the candied lemon zest into each gap, then serve.
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