01 - Blend flour, powdered sugar, and salt in a food processor. Add cold butter and pulse until mixture resembles coarse crumbs. Add egg yolk and 1 tablespoon cold water, pulsing until dough just comes together. Add additional water only if necessary to form dough.
02 - Flatten dough into a disk, wrap in plastic, and refrigerate for at least 1 hour. On a lightly floured surface, roll out dough to fit a 9-inch tart pan. Press dough into pan, trim edges, and prick base with fork. Chill shell for 15 minutes.
03 - Preheat oven to 350°F. Line tart shell with parchment paper and fill with baking weights. Bake for 15 minutes, then remove weights and paper. Bake for another 10 minutes until golden brown. Allow to cool completely.
04 - Whisk together mango puree, eggs, egg yolks, sugar, and lime juice in a saucepan. Cook over medium-low heat, stirring constantly, for about 10 minutes until mixture thickens and coats the back of a spoon. Remove from heat.
05 - Stir butter cubes into hot curd until melted and smooth. Pass curd through a fine mesh sieve for extra silkiness. Allow to cool slightly.
06 - Pour mango curd into cooled tart shell, smoothing the surface. Refrigerate for at least 1.5 hours until completely set.
07 - Arrange fresh mango slices, toasted coconut flakes, and mint leaves on top before serving. For added indulgence, serve with whipped cream or coconut sorbet.