Preheat oven to 375°F .

Measure out flour, sugar, salt, and cinnamon into a large bowl.

Add shortening and work in with a fork until it resembles coarse sand.

In a separate heat-proof bowl, heat water until nearly boiling and add the molasses.

Add baking soda to the molasses and stir as it bubbles.

Pour wet ingredients into flour and mix to combine.

Grease a 12 x 18” glass baking dish and press dough into pan.

Mark the top of the dough with a fork, then sprinkle extra sugar over it.

Bake for 30 - 35 minutes until cooked through in the middle.