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• Cooking spray
• 4 1/2 ounces all-purpose flour
• 2 ounces powdered sugar
• 1/4 teaspoon Diamond Crystal kosher salt
• 1 tablespoon freshly grated orange zest
• 8 tablespoons cold unsalted butter
• 7 ounces granulated sugar
• 1 tablespoon freshly grated orange zest
• 2 tablespoons Campari
• 2 tablespoons fresh lemon juice
• 1/2 teaspoon Diamond Crystal kosher salt
• 4 egg yolks
• 1 tablespoon cornstarch
• 5 tablespoons unsalted butter
• 2 ounces powdered sugar
• Orange slices