Preheat the oven to 425 degrees F (220 degrees C).
Stone Ground Whole Wheat Flour (3 cups)
All-Purpose Flour (1 cup)
Baking Soda (1 tsp)
Salt (1 tsp)
Buttermilk (1 1/2 cups)
, up to 1 3/4 cups, enough to make a stiff dough.
Sprinkle a little flour on a baking sheet and place dough on it.
Shape into a round shape and use a sharp knife to slice a large X about an inch deep across the entire surface.
Bake for 30-40 minutes, until risen and golden-brown on top. The bottom should sound hollow when tapped.
Wrap in a clean towel and cool completely on a rack before slicing.