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In a medium bowl, combine the sifted all-purpose flour with the baking soda, cream of tartar, and fine sea salt. Whisk these dry ingredients together thoroughly and set aside.
Using a stand mixer fitted with the paddle attachment (or a hand mixer), beat the softened unsalted butter, pure vanilla extract, and lemon flavoring until the mixture is light and creamy.
Gradually incorporate the granulated sugar into the butter mixture, beating well after each addition. Continue to cream until the mixture becomes notably light and fluffy.
Introduce the large egg yolks one at a time, ensuring each yolk is fully incorporated and the mixture is thoroughly beaten before adding the next.
Slowly add the prepared dry ingredient mixture to the wet ingredients in four separate additions. Mix on low speed only until just combined, being careful not to overmix the dough.
Roll the dough into uniform 1-inch balls. Arrange these dough balls approximately 2 inches apart on ungreased baking sheets.
Preheat your oven to 350°F (175°C). Bake the cookies for about 10 minutes, or until their edges turn a beautiful golden brown.