Mama Simmons' Buttermilk Biscuits

Preheat the oven to 425 degrees. Grease a baking pan with shortening. Sift the flour, baking soda, and salt into a bowl. Add the shortening and cut into the mixture until small pea-sized balls form. Add the buttermilk and stir until the mixture forms a soft dough. Turn the dough onto a lightly floured board and knead several times. Roll out dough and cut biscuits with a one and one-half-inch diameter biscuit cutter. Place biscuits in the prepared pan, with the biscuits touching, and brush tops with melted shortening. Bake 10 to 12 minutes and serve immediately.