Preheat the oven to 180.
In a bowl, combine the flour and salt with a whisk. Alternatively, you can sift them together.
Add the vegetable oil and mix with a rubber spatula in a cutting motion. When well incorporated, add the water and lightly mix until it comes together into a dough.
Roll out the dough to a 5 mm thickness with a rolling pin. Cut into desired sizes. Sprinkle the salt (rock salt) on top.
Bake in the oven for 20-25 minutes and they are done. Let them cool.