Something I've seen on sale in Istanbul a couple of times:
bundles of green stems about a foot long with slightly hairy
skin. You peel the skin off and chew them. They taste like
rather woody raw rhubarb. According to one person I spoke
to, they're from somewhere a long way from Istanbul. They
seem like the sort of thing a shepherd might chew on for
lack of any real fruit and then get nostalgic about. You
see peasants on buses chewing them. They doubtless have
lots of vitamin C but are not really a taste treat.

What is the plant? Turkish name or Linnaean binomial.

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