Lemon Icebox Cookies

In a food processor, pulse flour, confectioners' sugar, salt, and lemon zest until combined. Add butter and process until sandy. Add egg yolks and lemon juice; pulse until dough comes together. Divide dough in half and form each into a 1 1/2-inch-wide log. Wrap in plastic and freeze until firm, about 2 hours (or up to 1 month).

Preheat oven to 350 degrees, with racks in upper and lower thirds. Spread granulated sugar on a piece of parchment; roll logs over sugar to coat. Slice logs into 1/4-inch-thick slices and arrange, 1 inch apart, on two parchment-lined baking sheets. Bake until cookies are golden brown around edges, about 15 minutes, rotating sheets halfway through. Transfer cookies to wire racks to cool.