Preheat the oven to 350°F (175°C). In a mixing bowl, combine flour, butter, and sugar until crumbly. Add egg yolk and mix until dough forms.

Press the dough into the tart pan evenly and prick with a fork. Bake for 15 minutes or until golden.

In a saucepan, combine mango puree, sugar, eggs, and lime juice. Cook over medium heat, stirring constantly until thickened.

Remove from heat and stir in butter until melted. Let cool slightly.

Pour the mango curd into the baked crust and spread evenly. Chill in the refrigerator for at least 2 hours before serving.