Combine the masarepa, salt and water together in a mixing bowl. Mix well and let rest for 5 minutes.
Mix the dough again until smooth. It should have the consistency of playdough and not stick to your hands. If it is too dry, add a tablespoon of water and mix until smooth.
Hand form the arepas dough into 8-10 small patties, about 4-5 inches across and ½ inch thick.
Heat a grill pan or cast iron pan to medium heat and lightly oil or butter. Cook the arepas until golden brown on each side, about 10 minutes total. The outer shell will harden and form a crisp crust, with a softer or hollow interior. (NOTE: You can also pan cook them until crispy on the outside, then finish them in your oven or air fryer at 350 degrees F/177C for 8-10 minutes).
Cool slightly and serve as desired.