Pure maple syrup is nothing more nor less than the sweet sap of the maple tree reduced to a syrup consistency by boiling. It is very expensive, but has an extraordinary taste that is sensational in desserts. It bears no resemblance to commercially produced pancake syrups.
Often sold in tins, once opened the syrup should be transferred to a glass jar and kept, tightly closed, in the fridge, where it will keep forever. It may also be kept in the freezer without detriment. If left too long in the opened original can it will darken but, more importantly, the flavour may be affected. Syrups described as ‘maple-flavoured’ are poor imitations and are best avoided.