01 - Blend flour, powdered sugar, and salt in a food processor. 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 a cohesive dough.
02 - Flatten dough into a disk, wrap tightly in plastic wrap, and refrigerate for at least 1 hour. On a lightly floured surface, roll dough to fit a 9-inch tart pan. Press dough evenly into pan, trim excess edges, and prick base thoroughly with a fork. Return shell to refrigerator for 15 minutes.
03 - Preheat oven to 350°F. Line chilled tart shell with parchment paper and fill completely with baking weights or dried beans. Bake for 15 minutes, then carefully remove weights and parchment. Continue baking for 10 minutes until crust is golden brown. Allow to cool completely before filling.
04 - Whisk together mango puree, whole eggs, egg yolks, granulated sugar, and lime juice in a saucepan until smooth. Place over medium-low heat, stirring constantly with a heat-resistant spatula. Cook for approximately 10 minutes until mixture thickens enough to coat the back of a spoon. Do not let mixture boil.
05 - Remove saucepan from heat immediately. Add cubed butter, stirring until completely melted and incorporated. For an ultra-smooth consistency, press curd through a fine-mesh sieve into a clean bowl. Allow to cool slightly before using.
06 - Pour slightly cooled mango curd into the completely cooled tart shell. Use an offset spatula to create an even, smooth surface. Refrigerate for at least 1.5 hours or until curd is completely set and firm to the touch.
07 - Arrange fresh mango slices in a decorative pattern over the set curd. Sprinkle toasted coconut flakes around the edges and garnish with fresh mint leaves. Serve chilled, ideally the same day as assembly for optimal texture.