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Line a large baking sheet with parchment paper.
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In a bowl, combine the semolina flour, AP flour, granulated sugar, butter, egg yolks, cinnamon, orange zest and salt.
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Mix together with a wooden spoon, making sure butter is evenly distributed.
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Alternatively: Cream the butter and sugar in a mixer till just fluffy. Add the egg yolks, one at a time, till incorporated. Add the flours,cinnamon, orange zest and salt. Finally fold in the chopped walnuts.
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Shape the dough into 1" balls and arrange on the prepared baking sheet, leaving 1" between each cookie. Press down lightly on them so that they don't roll around.
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Chill in the fridge for 1 hour.
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Preheat the oven to 325F. Using the palm of your hand, crush the cookies into disks, the edges will look slightly cracked.
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Bake for 30 minutes, until they are golden brown and have a crumbly, shortbread texture. Transfer to a wire rack to cool completely.
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Dust the tops with the icing (confectioners) sugar. Or alternatively, you can lightly coat the entire cookie.
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They will keep in an airtight container for one week.