Shortbread Crust

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   ["1. Whisk together four, sugar, lemon rind and salt", "", "2. Cut in butter until mixture resembles coarse breadcrumbs", "", "3. Add one egg yolk and mix until dough comes together in a ball", "", "4. Refrigerate for at least 30 minutes if the butter was softened beforehand or if the mixture has warmed", "", "5. Spread evenly on bottom of greased pan. Prick thoroughly with a fork.", "", "6. Bake at 400 degrees for 18 to 22 minutes", "", "7. Meanwhile, whisk second egg yolk and a pinch of salt", "", "8. After crust is baked, use brush to apply egg yolk glaze", "", "9. Return to oven until the egg glaze sets - 1 to 2 minutes."]

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