01 - Blend flour, powdered sugar, and salt in a food processor. Add cold butter and pulse until mixture resembles coarse breadcrumbs. Add egg yolk and 1 tablespoon cold water, pulsing until dough just comes together. Add more water only if necessary. Flatten into a disk, wrap tightly, and refrigerate for at least 1 hour.
02 - Roll chilled dough on a lightly floured surface to fit a 9-inch tart pan. Press dough evenly into pan, trimming excess from edges. Prick base thoroughly with a fork. Refrigerate shell for 15 minutes. Preheat oven to 350°F.
03 - Line tart shell with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes. Remove weights and parchment, then bake for an additional 10 minutes until golden brown. Cool completely.
04 - Whisk mango puree, eggs, egg yolks, sugar, and lime juice in a saucepan. Cook over medium-low heat, stirring constantly until thickened, about 10 minutes. Mixture should coat the back of a spoon. Remove from heat.
05 - Stir butter cubes into hot curd until melted and completely smooth. Strain through fine mesh sieve for silky texture. Cool slightly.
06 - Pour mango curd into cooled tart shell, spreading evenly. Refrigerate for at least 1.5 hours until completely set.
07 - Top with fresh mango slices, toasted coconut flakes, and mint leaves before serving. Serve chilled.