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Heat oven to 200C/180C fan/gas 6. Grease 2 x 20cm sandwich tins and line the bases with baking parchment. Apart from the hundreds & thousands, beat all the cake ingredients together in a large bowl, using an electric whisk, until fully combined and smooth. Quickly but gently stir through the hundreds & thousands – don’t mix too much or the colour from them will bleed. (To get the spotty effect in the sponge, you won’t be able to use naturally dyed hundreds & thousands as the colour will bleach out during cooking. We used Wilton Rainbow Sprinkles available from Amazon.)
Divide the mixture between the tins and bake for 15-18 mins, until risen and golden brown. Leave to cool a little in their tins before turning out onto a wire rack to cool completely.
On a surface lightly dusted with icing sugar, roll out the yellow fondant and cut out a 20cm circle – use the loose base of a sandwich tin as a guide. Brush the top of one of the cakes with a little raspberry jam and pop the fondant circle on top. Roll out the coloured icings in turn and cut out small circles – you could use the wide end of a piping nozzle for this. Dot a small amount of jam under each circle and arrange on top of the yellow fondant.
To make the filling, tip the cream and lemon curd into a large bowl and whip by hand to a soft peak. Sandwich the cakes together with remaining raspberry jam, topped with a layer of lemon cream.