1. In a bowl, mix the grated coconut with the sugar.
2. Add the egg whites and vanilla essence. Mix until you get a homogeneous mass.
3. Add the cornstarch and continue mixing until well incorporated.
4. Take small portions of dough and form balls. Then flatten them into disk shapes.
5. Place the discs on a previously greased oven tray or with baking paper.
6. Preheat the oven to 350 °F (180 °C) and bake the coconut discs for about 15-20 minutes or until golden.
7. Remove the discs from the oven and allow them to cool completely.
8. Once the discs are cold, spread a layer of dulce de leche on the bottom of one of the discs, then place another disc on top to form the alfajor.
9. Finally, pass the edges of the alfajor through extra grated coconut to decorate.
