Pre-heat the oven to 180 degrees/gas mark 4. Grease or line a 15cm/6inch tin with baking parchment. Beat together the butter and sugar until light and fluffy.
Add the ground and flaked almonds, vanilla extract and eggs and mix well. Mix in the lemon rind and juice, polenta flour and baking powder.
Finally fold in the raspberries. Spoon into the prepared tin and bake in the pre-heated oven.
For the sauce pour the lemon juice caster sugar, and water into a saucepan and heat through stir until the sugar has dissolved. Simmer gently to form syrup.
When the cake is ready, remove from the oven and cool slightly before pouring some syrup over the cake.
To serve, slice the cake and drizzle a little syrup on to the plate, add a dollop of crème fraîche, dust with a little icing and scatter a few fresh raspberries.
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