In a bowl, cream together 2 cups sugar, 1 cup of packed brown sugar, and 8 ounces shortening.
Add 4 slightly beaten eggs, 3 tablespoons molasses, 1½ teaspoons salt, and 1½ teaspoons dissolved baking soda. Combine well.
In a separate bowl, sift together 3 cups flour, 1½ teaspoons ginger, and 1½ teaspoon cinnamon. Combine with the sugar mixture.
Refrigerate dough for several hours.