One has to have some sort of treat to keep the wee folk appeased, and this seems to do the trick for me...
Boil the sugar, vinegar and syrup together until it reaches 300F, or the "soft crack" stage for us old fashioned cooks. Remove it from the heat and add the soda, stirring well and quickly. Pour into a deep oiled pan and stand back, as it grows quickly after the soda is added... (make a batch, you'll see what I mean..) Let cool, break into pieces. Serve as is or dip chunks in white chocolate for a real treat worthy of Titania herself. If you're lucky enough to have an old metal ice cube tray, use that to mould the candy into bars and you'll get something very like a "crunchie" bar if you dip it in milk chocolate.