Preheat oven to 375 degrees. *(Important clarification: This can be done *after your dough has chilled for several hours. No need to preheat at the start—just before baking!)
Mix flour and salt together and cut in shortening as for pastry (Mennonitese for pie.)
In another bowl, combine molasses and sugar.
Add egg and beat well.
Dissolve soda in hot water and add to molasses, egg, and sugar mixture.
Combine crumbs and molasses mixture and stir until well blended.
Chill dough for several hours.
On a lightly floured board, roll cookie dough to 1/4 inch thickness. Use a 2-inch cookie cutter or drinking glass to cut the cookies from the dough.
Place on a greased cookie sheet and bake until a deep rich brown, about 10 minutes.
Makes about 4 dozen cookies, probably not nearly enough for your liking.
Notes
Use either light or dark molasses for this cookie recipe.