Sift flour, salt and soda and sugar together in med. mixing bowl. Mix in shortening with tips of fingers; add buttemilk and gently knead into a semi-stiff ball of dough. (Note: Add more flour if needed.) Lift dough onto well-floured work surface, knead JUST UNTIL SMOOTH and firm enough to handle. Roll or pat (preferred) to 1 cm thick, and cut with floured cutter, or with knife, or rim of drinking glass. Place biscuits on greased cookie sheet, and bake in preheated 200ºC . oven for 10 to 15 min., or until brown.