Lyle's Golden Syrup, manufactured by the British sugar company Tate & Lyle, has just been honored by the Guinness Book of World Records with the title of world's oldest brand. The sweet syrup is a byproduct of sugar refining and was first put into the distinctive green and gold tin in 1885. The packaging and the syrup have remained almost completely unchanged since that time. The product is found in more than 85% of British households and is popular in countries all over the world.
In the US, the syrup is found at some specialty stores, but is not terribly easy to come by. It has the consistency of corn syrup, but a much more unique flavor that carries over into whatever it is used to sweeten. There are any number of recipes that the syrup can be used in, but treacle tart and ANZAC biscuits are two that are well loved world wide.