Joseph Walker used only the best ingredients to make the famous pure butter shortbread recipe he created in 1898 at his Bakery in Aberlour, Scotland. More than a century later Walker's is one of the bestselling shortbreads in the world and it’s still made with the same four quality ingredients: flour, butter, sugar, and salt.
But just knowing the ingredients still leaves you a long trip away from great shortbread—a fact that’s best confirmed by giving any other copycat recipe a try. If a recipe calls for all-purpose flour and/or standard granulated sugar and salt, you’re destined for disappointment.
The secret ingredient in a perfect Walker's Shortbread cookie is pastry flour. It has less gluten than all-purpose flour and will produce a tender bite mirroring the original cookies, but it still provides a stable structure that won’t spread out when baked. My favorite pastry flour is Bob’s Red Mill.
There is no leavening in these cookies (that’s why they're called shortbread), so the sugar and salt are whipped into the butter until it’s fluffy which works in air bubbles that provide a lift to your shortbread when baked. Standard sugar and salt grains won’t easily dissolve in the butter, so I'm using superfine sugar here (baker’s sugar) and superfine salt (popcorn salt) to produce perfect shortbread with a clean bite that’s free of any detectable sugar or salt granules.
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