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Place an ovenproof dish (I use an enamel one) filled with about an inch of cold water on the floor of the oven.
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Preheat oven to 160°C and set the shelf so the cake tins will be no higher than halfway up the oven.
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Grease and line two 20cm loose bottomed sandwich tins. Baking parchment lined with foil is fantastic as it is nice and thick so helps with even browning. I spray the inside of the lining (have the parchment against the cake batter) with oil - you don't want any stickage for a naked cake look!
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Cream butter and sugar together until very light and fluffy, which will take several minutes for butter. CAUTION - for the dairy free version, this will take a mere 60 seconds and you should use the spread straight from the fridge. Beat it too long and it will split and curdle.
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Sift the flour and raising agents together twice.
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Beat in one egg, plus a spoonful of the flour, then repeat for the remaining eggs.
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Sift over the remaining flour, scrape in the yogurt and vanilla then mix until no streaks remain. Do not over mix.
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Divide the mixture between the two tins, spreading the mixture up the sides of the tin so there is a hollow in the middle. This helps them to bake nice and flat. Bake for 35 minutes.
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Cool in the tins for 10-15 minutes then unmould and finish cooling on a rack. I lightly cover them with a clean tea towel. If not filling until the next day, wrap the stone cold cakes in clingfilm and store someplace cool.
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When ready to sandwich, beat the butter until lightened then sift over the icing sugar and beat until light and fluffy. Again if making a dairy free version, this takes a fraction of the time and do stand and watch to ensure you catch it before it splits. Add in the vanilla and a little milk if not soft enough.
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Use a little buttercream to secure one of the cakes to the cake board then spread the cake with the jam of your liking. Place the rest in the piping bag with the nozzle fitted and starting at the outside edge working inwards, pipe in concentric circles, leaving just half an inch of cake around the edge to allow for settling when stacked.
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Top with the second cake and press down to secure - you can use a very clean spirit level to check it is level if you like. The beauty of this recipe is I've never had to trim a cake as it rises perfectly flat.
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Dust heavily with icing sugar and top with the fresh fruit.
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(If stacking with other cakes, push the dowels through the cake at the 12, 3, 6 and 9 o'clock positions about an inch in from the outline of the cake to be stacked upon it. Trim level with the cake using pliers. Use a little extra buttercream over the exposed dowels to secure the next tier with.)