crust: in a large bowl, combine flour, sugar , salt , and baking soda. cut-in 1 cup vegetable shortening. separate the eggs. place egg yolks in a 1 cup measuring cup and add milk to the egg yolks until milk and egg yolks equal 2/3 cups.
blend the egg mixture into flour mixture until it reaches a dough consistency.
divide the dough in half. roll out 1/2 of the dough to fit the bottom of the jelly roll pan. the crust will be very thin.
glaze : in a small bowl, combine powdered sugar and lemon juice for . blend until smooth. adjust consistency (add lemon juice if too dry; add powdered sugar if too runny). drizzle over the top of the warm bars.