For Cookies: Preheat oven to 375º. Mix shortening, sugar, and eggs thoroughly. Blend in sour cream and vanilla. Combine flour, salt, and baking soda in a separate bowl, then add to the mixture. Mix thouroughly and chill dough if too soft to handle. Drop rounded teaspoons full of dough onto a greased cookie sheet approximately 2 inches apart. Bake for 10 minutes or until there are no more imprints in the dough.
For Glaze: Melt butter until golden brown, remove from heat. Mix in powdered sugar and vanilla. Add hot water to obtain glaze consistency; glaze should spread/flow smoothly on cookies(Should not be as thick as for icing). Glaze cookies.