Preheat oven to 425 degrees. Grease and flour a 9-inch round cake pan.

In a large bowl, combine the flour, baking soda and salt. Gradually stir in the buttermilk until the dough comes together in a slightly sticky ball.

Turn dough onto a floured surface and knead gently a few times. Form the dough into a ball and then press into the prepared pan so that the dough resembles a large disk. The dough should reach the edges of the pan, but may spring back slightly.

Cut an X into the dough with a sharp knife, about 1/4 of an inch deep. Cover the pan of dough with another round cake pan turned upside down.

Bake for 25-30 minutes, covered, then remove the top pan and bake uncovered for about 10 minutes more or until the crust is dark golden brown.