In a large bowl, combine the flour, sugar, rosemary, baking powder, salt and baking soda. Cut in shortening until mixture resembles coarse crumbs. Stir in buttermilk just until moistened (mixture will be dry).
Turn onto a lightly floured surface. Roll out to 1/2-in. thickness. Cut with a floured 2-1/2-in. biscuit cutter. Place 1 in. apart on a greased baking sheet. Brush with butter. Bake at 400° for 10-12 minutes or until golden brown. Serve warm.