
3/4 cup (100 g) powdered sugar
1/2 cup (65 g) finely ground pistachios
2 large egg whites (60 g), aged
1/4 cup (50 g) granulated sugar
1/4 teaspoon cream of tartar
Green gel food coloring
1/2 cup (113 g) unsalted butter, softened
1 cup (120 g) powdered sugar (for buttercream)
1–2 tablespoons heavy cream
1 teaspoon vanilla extract
Pinch of salt