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