Preheat the oven to 350 degrees. Place 1¼ cups of the coconut on a sheet pan and spread into an even layer. Toast the coconut in the oven until it is fragrant and lightly browned, 8 – 10 minutes, stirring once or twice during cooking for even browning. Reserve ¼ cup of the toasted coconut for garnish.
In a mixing bowl, combine the remaining 1 cup of the toasted coconut with the graham style crumbs and the coconut oil. Press into four 4 inch tart pans with removable bottoms, an 8 inch tart pan or even a 9 inch pie plate, making sure to get the mixture up the sides as well as on the bottom. Place in the freezer to cool and harden - about 15 minutes. While the crust hardens, make the filling.
In a medium saucepan whisk together the coconut milk, brown sugar, tapioca starch and salt. Heat the mixture over medium heat, stirring constantly, until it thickens, just about 3 minutes. Stir in the vanilla. You can press the mixture through a sieve if you like to make sure there are no lumps. Stir in the ½ cup of coconut flakes you did not toast. Pour the mixture into the prepared tart pan(s) or pie plate. Let the tart cool in the fridge until ready to serve. Garnish with reserved toasted coconut flakes.