Layered Chocolate Pistachio Ganache Tart with Cocoa Pastry

Ingredients

• 1 1/4 cups all-purpose flour
• 1/4 cup unsweetened cocoa powder
• 1/2 cup unsalted butter, cold and cubed
• 1/3 cup powdered sugar
• 1 large egg yolk
• 1–2 tablespoons cold milk
• Pinch of salt
• 1/2 cup heavy cream
• 100g dark chocolate (at least 60%), chopped
• 1 teaspoon vanilla extract
• 1 cup unsalted shelled pistachios, plus extra for garnish
• 1/4 cup whole milk
• 3 tablespoons granulated sugar
• 1 tablespoon cornstarch
• 1/2 teaspoon almond extract (optional)
• 100g dark chocolate, chopped
• 1 tablespoon butter
• Chopped or whole roasted pistachios