INGREDIENTS
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1 1/3 cup (6 oz) flour
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1/2 cup (2 oz) custard powder (Bird’s Custard Powder-available on Amazon and in British shops)
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1 1/2 sticks (6 oz) butter, at room temperature
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1/2 cup (2 oz) powdered (icing) sugar
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1/4 tsp baking soda
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Filling
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1/4 stick (1 oz) butter
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1/2 cup (2 oz) powdered (icing) sugar
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a few drops of vanilla extract