Melt the lard in a medium bowl. Add the kosher salt and stir to combine.
Add the hot water and stir until the salt is mostly dissolved and the mixture is combined.
Add the flour and mix until a shaggy dough forms.
Turn the dough out onto a lightly floured surface. Knead for 3 to 4 minutes, or until the dough is smooth, soft, and tacky but not sticky.
Divide the dough into 6 equal pieces. Roll each piece into a ball.
Flatten each dough ball slightly and place on a lightly greased plate. Cover and rest for 30 minutes.
Lightly flour your work surface. Roll each dough ball as thin as possible, about 6 inches across. You can cook each tortilla as you roll it, or roll them all first and stack them between pieces of parchment paper. Keep rolled tortillas covered with a kitchen towel so they do not dry out.
Heat a cast iron skillet or comal over medium-high heat. Place one tortilla in the hot skillet and cook for 20 to 30 seconds, or until bubbles begin to form.
Flip and cook the second side for another 20 to 30 seconds.
Transfer the cooked tortilla to a tortilla warmer or a plate lined with a clean kitchen towel. Cover while you cook the remaining tortillas.
Serve warm, or cool completely before storing.