black treacle or molasses

Black treacle (British English) or molasses (American English) is a dark, viscous byproduct of sugar refining, specifically the final molasses extracted after crystalline sugar has been removed from sugarcane juice through repeated boiling and centrifugation. The ingredient is characterized by its deep brown to nearly black color, thick consistency, and complex flavor profile combining bittersweet, slightly smoky, and mineral notes with undertones of caramel and toffee.

The production process involves concentrating sugarcane juice through evaporation and crystallization; black treacle represents the final or "blackstrap" stage, containing significantly more molasses after the majority of sucrose has been extracted. This concentration gives it a more intense flavor and higher mineral content than lighter molasses varieties (such as light or dark molasses). The terms are largely interchangeable, though "molasses" is prevalent in North American usage and "treacle" in British Commonwealth nations.

Black treacle serves as both sweetener and flavoring agent in baking, brewing, and savory applications. In British baking, it is essential to sticky gingerbread (parkin), treacle tart, and dark fruit cakes, where its distinctive bitter-sweet character complements spice and dried fruits. American molasses features prominently in baked beans, barbecue sauces, and gingerbread. Beyond sweets, it appears in cured ham glazes, dark ales, and porter beers, where its molten, caramel-like richness and slight mineral tang enhance depth. The ingredient's hygroscopic properties maintain moisture in dense cakes and cookies. Its viscosity requires careful measurement—often it is warmed slightly to facilitate incorporation into batters.