How did blackstrap gets its name?

Blackstrap molasses gets its name from the process of sugar extraction. During sugar refining, the juice from sugarcane or sugar beets is boiled down to create sugar crystals, and blackstrap is the third boiling, producing a thick, dark syrup. The term "blackstrap" refers to the "strap" or residue left after the sugar has been extracted multiple times, resulting in a strong, robust flavor and higher nutrient content compared to lighter molasses varieties.