01 - Blend flour, powdered sugar, and salt in a food processor. Add cold butter cubes 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. Flatten into a disk, wrap tightly, and refrigerate for minimum 1 hour.
02 - Roll chilled dough on lightly floured surface to fit 9-inch tart pan. Press dough evenly into pan, trim excess edges, and prick base thoroughly with fork. Refrigerate shell for 15 minutes while preheating oven to 350°F.
03 - Line chilled shell with parchment paper and fill with baking weights or dried beans. Bake for 15 minutes, remove weights and parchment, then continue baking 10 minutes until golden brown. Cool completely before filling.
04 - Whisk mango puree, whole eggs, egg yolks, sugar, and lime juice in saucepan. Cook over medium-low heat, stirring constantly, for approximately 10 minutes until mixture thickens enough to coat back of spoon. Remove from heat.
05 - Stir butter cubes into hot curd until completely melted and smooth. Strain through fine mesh sieve to remove any cooked egg bits for silky texture. Let cool slightly.
06 - Pour mango curd into cooled tart shell, spreading evenly. Refrigerate for at least 1.5 hours until completely set and firm.
07 - Top chilled tart with fresh mango slices, toasted coconut flakes, and mint leaves just before serving. Serve chilled.