Ingredients
Method
Make the Cookies
- In a small bowl, combine brandy, lemon zest and 1 teaspoon vanilla.
- In a large bowl, whisk together flour, cornstarch, baking powder, baking soda and salt.
- In the bowl of an electric mixer, beat sugar and butter until light and fluffy, about 3 minutes. Add yolks and beat to combine, then add brandy mixture and beat until just combined. Add flour mixture, and mix on low speed until the dough just comes together.
- Divide the dough in half and roll each piece into a log about 1½ inches thick. Wrap in plastic and chill until firm, at least 2 hours.
- Heat oven to 350 degrees F . Line 3 baking sheets with parchment paper. Remove dough from plastic wrap and slice into ⅛-inch-thick rounds. Place on prepared sheet pans, then bake until edges start to turn golden, about 7 minutes. Transfer each pan to a rack to cool completely.
- In a small bowl, combine dulce de leche with remaining 1 teaspoon vanilla and a large pinch of salt. Spoon the mixture into a plastic zipper bag and cut a corner off. (Or you could scoop it into a pastry bag if you prefer, or just use a spoon.)
- Flip half of the cookies upside down and pipe a thick layer of dulce de leche onto bottoms (or use a spoon to spoon the mixture on). Top with remaining cookies to sandwich the dulce de leche in the middle.
Make the Icing
- In a small bowl, add the powdered sugar. Then slowly add the lemon juice (or whatever you chose) until you reach the desired consistency.
- Spread this over the completed cookie!