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The ingredients need to be cold before you start.
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Place the flour in a bowl with a little salt, to taste.
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Then throw in the butter and use your fingertips to rub it into the flour until you get a crumbly, sand-like texture.
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Mix in the egg yolk and egg, just until they are both incorporated.
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At this point the dough will be wet and difficult to roll out.
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Lay some clingfilm on your counter and place the dough on top.
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Cover with more clingfilm.
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Roll lightly to flatten, then leave to rest in the fridge for at least one hour.
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Shape as desired, then cook at 150 C or 300 F until golden.
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For a round shortbread using all the dough, this will probably take about 30 minutes.