Preheat oven to 350°F. 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.
Recipe adapted from Nestle.