This recipe yields 3 1/2 dozen crispy outside, soft and chewy Ginger Snaps.
Standard butter contains water that creates steam and promotes lateral spread during baking. Shortening consists entirely of fat without water content, which limits gluten development and preserves the domed shape required for cookies with a crisp perimeter and tender center. Blending the fat and sugar until fully aerated incorporates microscopic air cells that expand when exposed to the 375 degrees F oven heat.
Ground ginger, cinnamon, and cloves provide the characteristic aromatic profile, but dark or light molasses supplies the crucial acidity needed to react with the baking soda. This chemical reaction produces carbon dioxide gas, lifting the dense dough mixture. Measure flour by weight or fluff it with a fork before spooning into the measuring cup to avoid incorporating too much protein, which toughens the final crumb.
Rolling dough portions in granulated sugar immediately prior to baking creates a distinct crystalline crust that contrasts sharply against the soft interior. Space individual portions two inches apart on parchment-lined sheets to allow for even heat circulation. Remove the baked batches after precisely 10 minutes while centers still appear slightly underbaked, letting residual heat finish the setting process on the metal pan for two minutes before transferring items to a wire cooling rack.