Preheat the oven to 210°F (100°C) and line a baking sheet with parchment paper.
In a clean bowl, whisk the egg whites with a pinch of salt until stiff peaks form. Gradually add the powdered sugar, continuing to whisk until the meringue is glossy and firm.
Using a spoon or piping bag, create small mounds of meringue on the prepared baking sheet.
Bake the meringues at 195-210°F (90-100°C) for 1.5-2 hours, or until they are completely dry.
While the meringues are baking, whip the heavy cream until stiff peaks form. Gently fold in the chestnut puree until well combined and creamy.
Once the meringues are completely cool, sandwich two meringues together with the chestnut cream.
Sprinkle the tops of the meringues with chocolate shavings and serve immediately.
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