01 - In a food processor, blend flour, powdered sugar, and salt. Add cold cubed butter and pulse until mixture resembles coarse breadcrumbs. Add egg yolk and 1 tablespoon cold water, pulsing until dough just comes together. Add additional water only if necessary to form dough. Flatten into a disk, wrap tightly in plastic wrap, and refrigerate for at least 1 hour.
02 - On a lightly floured surface, roll chilled dough to fit a 9-inch tart pan. Press dough evenly into pan, trimming excess from edges. Prick base thoroughly with fork. Return to refrigerator for 15 minutes while preheating oven to 350°F.
03 - Line chilled tart shell with parchment paper, filling completely with baking weights or dried beans. Bake for 15 minutes until edges are set. Remove weights and parchment, return to oven for 10 minutes until golden brown and fully cooked through. Cool completely on wire rack.
04 - In a medium saucepan, whisk together mango puree, whole eggs, egg yolks, sugar, and lime juice until smooth. Place over medium-low heat, stirring constantly with a heat-proof spatula, for about 10 minutes until mixture thickens enough to coat the back of a spoon. Remove from heat immediately.
05 - Add butter cubes to hot mango mixture, stirring until completely melted and incorporated. For silkiest texture, pass curd through a fine-mesh sieve into a clean bowl. Cool slightly, placing plastic wrap directly on surface to prevent skin formation.
06 - Pour mango curd into cooled tart shell, spreading evenly with offset spatula. Refrigerate for at least 1.5 hours or until curd is completely set and firm.
07 - Before serving, arrange fresh mango slices in decorative pattern over curd. Sprinkle with toasted coconut flakes and garnish with fresh mint leaves. Serve chilled.