Place the masa harina in a medium bowl and add the salt and water. Stir to combine and empty the dough on to a clean counter.  Knead the dough with the palms of your hands until it comes together.  Form into a ball, place on a plate and wrap the plate with plastic wrap.  Set aside to let it rest for 30-60 minutes.

Once the dough has rested, divide the dough into 35 gram balls of dough (a golf ball size) and roll each into a ball.  Place one square sheet of parchment on the bottom of the tortilla press, place a ball of dough in the middle, top with another piece of parchment paper and press the tortilla using the tortilla press.  

Place a medium cast-iron pan over medium heat.  Cook each tortilla on each side for 1-1 1/2 minutes. The tortilla will slide around the pan (not stick) when it's ready to flip.  Once cooked immediately transfer the tortilla to a tortilla warmer, cover with the lid and repeat until all of the tortillas are cooked.

Serve the tortillas with your favourite fillings and enjoy!  These are best served immediately.