Heat oven to 325°. Cream shortening one minute. Add sugar and salt. Beat for five minutes until light and fluffy. Add flour slowly and mix until crumbly.
Weigh out 14 ounces of the mixture and pat flat and even on bottom of a 9-by-13-inch pan. In a separate bowl, combine baking soda and molasses. Add hot water and mix. Add the remaining crumb mixture (about one pound) to the molasses mixture. Beat until most of the white pieces are out of the mixture.
Pour over the crumbs in the pan. Bake for 25 to 35 minutes or until done; Serve cake topped with a tablespoon of whipped cream cheese and the warm Lemon Sauce.
Lemon Sauce
Mix sugar, salt and cornstarch together in a pan. Add 3 cups of water and all the lemon juice. Bring to a boil.
Beat the remaining water and egg yolks together. Add to the boiling mixture and bring back to a boll.
Boil over low heat for 5 minutes. Add butter and remove from heat. Serve warm.