Ladyfingers for Tiramisu

Draw two 13-by-4-inch rectangular templates on each of two pieces of parchment paper; place on rimmed baking sheets; set aside. Prepare a large pastry bag with a 1/2-inch tip, and set aside.

Heat oven to 350 degrees. Whisk yolks, 10 tablespoons granulated sugar, and vanilla using high speed on an electric mixer fitted with the whisk attachment, until mixture is thick and pale, 1 to 2 minutes. Gradually add flour, folding in gently; set aside. Using electric mixer, whisk egg whites until frothy. While whisking, gradually add remaining 1 tablespoon sugar; beat until stiff, 1 to 2 minutes. Fold 1/3 of whites into reserved yolk mixture to lighten, then fold in remaining whites until just incorporated.

Fill pastry bag with batter, and pipe ladyfingers, 1/2 inch thick, between the short lines drawn on parchment paper. Using a fine mesh sieve, generously dust ladyfingers with confectioners' sugar, and allow the sugar to soak in, about 3 minutes. Place in oven and bake, rotating trays once, until light golden, 15 to 18 minutes. Transfer to wire racks to cool and dry out slightly, at least 2 hours. Remove from parchment paper.