Cream together eggs, sugar, shortening and salt. Take milk, vinegar and soda and mix together until foamy. Add to sugar mixture and beat. Add baking powder and anise oil then mix well. Add flour, one cup at a time, until mixture is stiff and able to roll out. Roll dough out on flour about 1/4 inch thick. Cut with cookie cutters and bake at 350 degrees for 6-8 minutes. Cookies will be white on top and will move easy on pan when done.