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Weigh out 250g of cucumber (weigh before deseeding), cut lengthways and scoop out the seeds (best way is to use a teaspoon)
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Chop the cucumber into chunks and blend with 25ml water until no big chunks remain.
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Cream the margarine, sugar and lemon together with a fork then, beat in one of the eggs. Add some of the flour, beat, then add the other egg, add the rest of the flour and beat well.
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Fold in the blended cucumber until well combined. Pour the mix into two 8in round baking tins
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Place the cakes in an oven preheated to gas mark 5/190c and bake for 25-30 mins until browned on top and cooked through.
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Once cooked, remove from the oven and turn out onto a cooling rack. Allow to go completely cold.
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To make the buttercream, cream all the buttercream ingredients together with a fork. Spread half in the middle of the two cakes and the rest on top. Finish off with a little lemon zest and grated cucumber.