Jam roly-poly, shirt-sleeve pudding, dead man's arm or dead man's leg is a traditional british pudding probably first created in the early 19th century. it is a flat-rolled suet pudding, which is spread with jam and rolled up, similar to a swiss roll, then steamed or baked and traditionally served with custard. in days past, jam roly-poly was also known as shirt-sleeve pudding, because it was often steamed and served in an old shirt-sleeve, leading to the nicknames of dead-man's arm and dead man's leg. in the past it was known as roly poly pudding.
Source: Wikipedia