Mix 1 teaspoon baking soda with 1 teaspoon water and set aside.
Cream together shortening, granulated sugar and brown sugar.
Add vanilla, eggs and baking soda/water mix.
Gradually beat in flour and salt.
Mix in chocolate chips.
Divide the mixture between 3 greased 9-inch cake pans (or a 9×13 inch pan for bars) and spread out.
Bake at 350°F for 15 minutes (20-25 minutes for 9×13) until golden brown.
Allow the cookies to cool completely. Flip the pans over and smack the bottom to release the cookie. Put it on a platter and spread slightly softened vanilla ice cream over it. Working quickly, do the same with the middle layer. Top with remaining chocolate chip cookie and a scoop of ice cream.
Drizzle with chocolate letting some drip down the sides. Promptly put the cake into the freezer until ready to serve.