In a small pot, put the water, salt and butter and put it on a medium heat. Cook until the butter and the salt have melted completely. Cool to room temperature.
Once the butter and salt water has cooled, incorporate the liquid into the flour. Use a bigger bowl and mix by hand, or if you have a kitchen robot, like Kitchenaid, it will be quicker and easier. Work the dough until smooth, for about 15min.
Roll out the dough in 3mm thickness.
Use a round shaped object, like a lid of about 12 cm in diameter, but it can be slightly smaller or slightly bigger.
Cut out the round shapes in the dough.
But the round dough pieces stacked on top of each other with some baking paper in between, so they don't stick together.
Leave in the fridge for at least 30min before filling and cooking.