No, these aren't sunny-side-up eggs! They're light-as-air meringues filled with homemade lemon curd and sprinkled with poppy seeds -- they make a show-stopping Easter dessert.
Preheat oven to 200 degrees. Draw eight 3-inch egg shapes on a piece of parchment. Place on a baking sheet, marked-side down.
Beat egg whites, lemon juice, and vanilla on medium-low until soft peaks form, about 4 minutes. Reduce speed to low and gradually add sugar. Increase speed to high and beat until stiff, glossy peaks form, about 3 minutes. Sift cornstarch over bowl and fold into whites with lemon zest.
Fit a pastry bag with a large fluted tip (such as Ateco #825) and fill bag with meringue. Secure corners of parchment to baking sheet with dabs of meringue. Pipe a border of meringue along the inside of an egg shape, then add an extra layer around perimeter to form a 1-inch collar. Pipe a dab of meringue in the center and smooth with the back of a spoon to create an indentation. Repeat with remaining egg shapes.
Bake 1 hour. Reduce heat to 175 degrees and bake until meringue has dried and is firm enough to pull off the baking sheet, 3 to 4 1/2 hours. Let cool completely before filling with curd and sprinkling with poppy seeds.