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when I was a wee lad, we had dandelion honey made in the kitchen from dandelion flower. Not really a sirup per say but close.

When I make maple syrup it is vacuum packed in jars.

Something jarred a memory so I did a search and came up with this.

http://www.henriettes-herb.com/blog/sweet-flag-syrup.html

not really a edible as much as a herbal remedy.

There is also maple syrup and birch syrup, made from sap boiled down.