01 - Preheat oven to 225°F. Line two baking sheets with parchment paper.
02 - In a completely clean bowl, beat egg whites until foamy. Add cream of tartar and continue beating until soft peaks form.
03 - Gradually add granulated sugar one tablespoon at a time, beating until stiff glossy peaks form and sugar is fully dissolved. Beat in vanilla extract.
04 - Gently fold the finely ground pistachios into the meringue using a spatula.
05 - Spoon or pipe the meringue into 8 nests approximately 3 inches wide on the prepared baking sheets, creating a small well in the center of each.
06 - Bake for 1 hour 30 minutes, rotating the trays halfway through, until completely dry and crisp. Turn off the oven, crack the door open, and let the nests cool completely inside.
07 - Whip the heavy cream with powdered sugar and vanilla extract until soft peaks form.
08 - Fill each cooled meringue nest with whipped cream. Top generously with fresh raspberries and sprinkle with chopped pistachios. Garnish with mint leaves if desired. Serve immediately.