In a bowl, stir together the flour and salt. Stir in the vegetable oil, then slowly pour in the hot water, stirring gently. When the dough comes together, turn it out onto a lightly floured surface. Knead it gently a few times to smooth it out.
Heat a cast-iron skillet or griddle over medium-high heat. Pinch off a piece of dough slightly smaller than a Ping-Pong ball and roll it into a 5-inch circle. It should be extremely thin.
Cook on the dry skillet for about 1 minute on the first side, until it starts to brown a little, then flip it and cook for about 30 seconds on the second side. Remove and stack onto a kitchen towel, then repeat with the rest. As you stack the tortillas, wrap them in the kitchen towel while you cook the next ones.