The British dessert made with black treacle, breadcrumbs, and lemon juice is treacle tart.
Treacle tart consists of a pastry shell filled with golden syrup, breadcrumbs, and lemon juice or zest. Despite its name, the main syrup in modern recipes is usually golden syrup, a pale sugar syrup; in British usage, “treacle” can refer broadly to sugar-refining syrups. The breadcrumbs absorb the syrup and give the filling its characteristic texture.
The tart became a standard British dessert during the nineteenth century, helped by the availability of commercially produced golden syrup. It is commonly served warm with custard, cream, or ice cream. Recipes may include ginger or other flavourings, but the syrup-and-breadcrumb combination remains central.
Treacle tart is sometimes confused with black treacle-based puddings. It also differs from Bakewell tart, whose defining topping is almond frangipane rather than a syrupy breadcrumb filling.