The recipe for Buckingham Palace Shortbread comes from a cookbook entitled, "Holiday Baking" by Sara Perry. She says the recipe was given to her by someone who insists it is the very recipe made daily for the Queen's afternoon tea.
1In a medium bowl, whisk together the flour, cornstarch and salt until well blended.
2In a stand mixer set on medium speed, beat the butter until creamy. Beat in the granulated sugar until light and fluffy, about 2 minutes, scraping down the sides and bottom of bowl as necessary. On low speed, add the flour mixture in two or three additions until it forms a soft dough.
3Wrap the dough with plastic wrap and chill for 30 minutes.
4Preheat the oven to 350. Line a baking sheet with parchment paper or leave ungreased.
5On a lightly floured surface, roll the dough out to a 3/4 inch thick slab, about 5 X 8 inches. (I used a large frosting spatula to get the edges into shape). Transfer to the baking sheet and bake until lightly golden and firm to the touch, about 40 minutes.
6Slip the parchment paper with the shortbread onto a hard surface. Immediately sprinkle the shortbread heavily with the superfine sugar. While still warm, use the spatula (or other straight, flat tool) and a paring knife, pointed straight down, to cut the shortbread into 1 - 1 1/2 inch pieces. Let cool completely. The shortbread tastes best at room temperature.
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