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 additional water only if necessary to form dough.
02 - Flatten dough into a disk, wrap in plastic, and refrigerate for at least 1 hour. Roll out dough on lightly floured surface 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, remove weights and paper, then bake for an additional 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 approximately 10 minutes until mixture thickens and coats the back of a spoon. Remove from heat and stir in butter cubes until smooth and melted.
05 - Pass mango curd through a fine mesh sieve to remove any lumps and achieve silky texture. Let cool slightly before assembling.
06 - Pour mango curd into cooled tart shell and smooth top with an offset spatula. Refrigerate for at least 1.5 hours or until completely set.
07 - Arrange fresh mango slices, toasted coconut flakes, and mint leaves on top before serving. Serve chilled with whipped cream or coconut sorbet if desired.