How do you make a rhubarb cordial syrup? Susan Jane White tells us....

It's rhubarb-mania here in my Covid-19 kitchen. I've pickled rhubarb, coaxed it into crumbles, peppered it into cookies with white chocolate, and even chopped it into salsa (don't try this at home). But the winning entry is this week's rhubarb & ginger syrup - or cordial, if you prefer. Ginger adds a delicious heat to anything it touches. I need to restrain myself from adding fresh ginger to everything in my orbit, such is my obsession.