Tart, Caramel-Pistachio

Ingredients

• 2-1/2 cups all purpose flour
• 1 cup (packed) pistachio halvah or plain halvah, crushed, packed (approximately 7 ounces)
• 2 tbsp. sugar
• 1/2 tsp. salt
• 3/4 cup (1-1/2 sticks) butter, chilled unsalted, cut into 1/2" cubes
• 2 large egg yolks
• 2 tbsp. ice water
• 2 cups sugar
• 1/2 cup water
• 1/2 cup heavy whipping cream
• 10 tbsp. (1-1/4 sticks) butter, chilled unsalted, cut into 1/2" cubes
• 1 cup natural unsalted pistachios (approximately 4 ounces), toasted
• Nonstick vegetable oil spray
• 1 large egg white
• 2 tbsp. (1/4 stick) unsalted butter
• 8 ounces bittersweet (not unsweetened) or semisweet chocolate, chopped
• 1 tbsp. light corn syrup