Preheat the oven to 525 degrees.
Grease the skillet first with the vegetable shortening.
Combine flour and salt in a bowl.
Create a whole in the middle, like a well.
Pour the buttermilk into the hole, and spread the shortening on top.
Mix the buttermilk and shortening using your hands, until there are no visible lumps.
Clean your hands, and then rub some flour on them.
Transfer the dough to your work surface.
Massage the dough softly and gently.
Cut the dough into one-inch-thick pieces, using a biscuit cutter.
Transfer the dough pieces to the greased skillet.
Place the skillet into the preheated oven, and reduce the heat to 500 degrees.
Bake until your biscuits turn golden, and the sides are soft.