In a mixing bowl, combine flour, salt and vegetable shortening with your hands until incorporated. Slowly incorporate water to the dough, until it can come together into a ball. Transfer to the counter and knead for about 2 to 4 minutes, until it is smooth like play dough. (You may do the same process in a food processor, pulsing until dough is incorporated!)
Divide into 18-20 ball shaped portions. Set them on a floured board or plate, cover them with plastic wrap or a clean kitchen towel and let them rest for 25 to 35 minutes.
Heat your comal, or ungreased cast iron or non-stick skillet over medium heat. On a floured surface roll out one of the balls with a rolling pin, rotating 5 or 6 times until you get a 6 to 7 inch circle. Lay tortilla on the already hot comal or skillet. You will hear a faint sizzle. After 30 to 40 seconds, when there are brown freckles on the bottom side and there is some puffing up in some areas of the tortilla, flip over. Cook for 30 to 40 seconds, until the other side is freckled and the tortilla puffs up, again, like pita bread. Don’t overcook, or they will become crisp and stiff (and lose all their appeal).
As they are ready, place in a tortilla warmer or clean kitchen towel. If you will not eat them within the hour, wrap them in a plastic bag and refrigerate. Reheat in a hot comal or skillet.