In a big bowl, add the flour, salt and shortening.then we are going to mix it up and to brake the shortening in very small pieces, you could use either your hands or your mixer like a sand texture. (not hand mixer) Once is like sand texture, we are ready to add our water, little by little. you will never use the same amount of water.In winter you may use more then summer.and start mixing up until you form a dough.if you feel like it needs more water, you can add a little bit a the time.Once you rich a beautiful dough, cover it and let it rest for at least 20 minutes.Then you are ready to make your balls and start making your tortillas.is very important to have your pan hot once you are adding your tortillas, and you are going to flip your tortillas 3 times in total. Good Luck.