Ham-Stuffed Biscuits With Mustard Butter

For the filling of this soft cookie, use your favorite slices of baked ham and spread liberally with mustard oil.
Combine the yeast and 1/2 cup warm water in a 4-cup liquid measuring cup and let the mixture sit for 5 minutes. Add buttermilk.Combine the flour and the following 4 ingredients in a large bowl; blend with a blender or fork until the mixture resembles coarse flour. Add the buttermilk, stirring with a fork, until the dry ingredients are moistened.Place the dough on a well-floured surface and knead 4-5 times.Roll out the dough 1/2-inch thick; cut into a 2-inch-thick round mold and place on lightly oiled baking sheets. Cover and let rise in a warm place (85 °), draughty, for 1 hour.Bake at 425 ° C for 10-12 minutes or until golden brown. Divide each cookie and spread evenly with mustard oil. Fill the cookies with ham.