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In a medium mixing bowl add flour, ground walnuts, baking powder and salt. Mix until incorporated.
In a separate mixing bowl add granulated sugar and lemon zest and rub with your finger until zest releases its oil and sugar is fragrant.
Add egg and egg yolk one at the time and mix well after each addition. Mix in vanilla.
Add in dry ingredients and mix until soft dough forms, but don't overmix.
Shape the dough into a disc and wrap in plastic wrap. Refrigerate for at least one hour.