Which of these sweet foodstuffs is the traditional filling in the American dish known as a Shoofly Pie?

Shoofly pie is a type of American pie made with molasses associated with Pennsylvania Dutch cuisine. Related to the Jenny Lind pie (a soft gingerbread pie), it may have originated among the Pennsylvania Dutch in the 1880s as molasses crumb cake. It was traditionally served not as a dessert pie, but as a breakfast food with hot coffee.

The modern form of shoofly pie as a crumb cake served in pie crust was a post-Civil War innovation, when cast iron cookware and stoves made pie crust more accessible for home cooks. It is also known as 'molasses crumb pie'. The name 'Shoofly pie' is taken from a brand of molasses that was popular in parts of the US during the late 19th century.

Molasses or black treacle (British English) is a viscous substance resulting from refining sugarcane or sugar beets into sugar. Molasses varies by the amount of sugar, method of extraction, and age of plant. Sugarcane molasses is primarily used for sweetening and flavoring foods in the United States, Canada, and elsewhere. Molasses is a defining component of fine commercial brown sugar. It is also one of the primary ingredients used for distilling rum.