Preheat the oven to 425°.

Sift together the flour, salt, baking powder, and baking soda.

Cut in the shortening until the mixture resembles coarse crumbles.

Add the buttermilk all at once and mix with a fork until it forms a ball.

Turn out the dough onto a floured surface and knead for 30 seconds.

Roll out the dough to ½-inch thickness and then cut with a biscuit cutter.

Place the biscuits on an ungreased baking sheet and bake for 15 minutes or until golden brown and done.