In a clean bowl, whisk the egg whites with a pinch of salt until stiff peaks form. Gradually add the granulated sugar while continuously whisking.
Continue whisking until the meringue is glossy and firm. Gently fold in the powdered sugar and cornstarch.
Mash the cottage cheese with a fork. Mix in the grated lemon zest, lemon juice, and vanilla sugar.
Gently fold the cottage cheese mixture into the whipped egg white meringue, being careful not to deflate it.
Transfer the meringue mixture to a piping bag fitted with a star nozzle. Pipe small meringue kisses onto a baking sheet lined with parchment paper.
Dry the meringue kisses in a preheated oven at 212°F (100°C) for approximately 90 minutes, until they are crispy on the outside and slightly soft on the inside.
Remove from the oven and let them cool completely before serving.
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