Scandinavians love to make these cookies at Christmas time but they will go down well any time of year.

375g flour
1 tsp baking powder
1 tsp lemon zest
125g brown sugar
250 cold butter, cut into small pieces
1 egg, beaten

Topping: 
Mix 2 tsp cinnamon and 50g demerara or granulated sugar in a small bowl
1 egg, beaten

Sift the flour and baking powder into a large bowl. Mix in zest and sugar then rub in butter until dough resembles coarse breadcrumbs. Mix in egg and knead on a floured surface for a couple...
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