In a medium bowl, mix together the flour, baking powder, and salt. Cut in the shortening with a pastry blender. Stir in the buttermilk.

On a lightly floured surface, knead the dough for about 5 seconds, adding a little flour if the dough is sticky. Roll into a 9 x 12 in. rectangle. Spoon the sausage over the dough, leaving a 1 in. border on all side. Roll up the dough, beginning at one short side. Refrigerate for 30 minutes.

Preheat the oven to 425 degrees F. Lightly grease a baking sheet.

Cut the rolled dough into ½ in. slices. Place these slices cut side down on the prepared baking sheet. Bake 25 to 30 minutes, or until the biscuit is golden and the sausage is cooked through.