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Preheat your oven to 170°.
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Cream room temperature butter and sugar together. Then add egg, vanilla, lemon zest and lemon juice and mix briefly to combine.
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Add the flour and mix together, don't forget to scrape the sides and bottom of the bowl and make sure it's all incorporated.
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The mixture will likely be quite soft so cover the bowl with cling wrap and put it in the fridge for about 20 minutes to harden up a little.
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Line a cookie sheet with parchment paper.
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Put powdered sugar into a bowl and caster sugar in another.
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Once the dough has hardened up enough to handle easily, take it and roll into a roller, then in a ball and flatten it gently with your hands. Dip first in the caster sugar and then in the powdered sugar
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Bake for 13 minutes in a 170° oven.
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Allow to cool a little before transferring from baking sheet.