In a bowl, combine diced mango, granulated sugar, lemon zest, and lemon juice. Set aside.
In a food processor combine flour, cold butter, granulated sugar, vanilla extract, and sea salt. Pulse several times to mix. Do not overmix.
Add water and pulse again several times to mix.
The mixture is ready when you pinch some of the crumbly dough together with your fingers it holds together.
Preheat oven to 350° F (175° C).
To assemble, add a layer of ½ part of a crumbles dough to a 7.5×9.5×2-inch glass rectangular dinnerware.
Gently press the crumbles dough down so that it lines the bottom of the dinnerware.
Fill the dinnerware with mango filling.
Sprinkle the rest of the crumbles dough on top of the mango filling.
Bake for 45-50 minutes.
When done baking, cool the mango crumble at room temperature.
Serve with vanilla ice cream. Enjoy!