cry havoc

A high proportion of the vegetarians I know are Hindu, closely followed by various variations of Buddhist - it's so easy to take the term 'vegetarian' (which is actually pretty recent - I think only about 150 years, at least in popular usage), and use it to rope together all sorts of different traditions, which isn't entirely unreasonable, where they can all be at least roughly summarised as 'don't eat meat', but it does overlook that what counts as meat, what would count as meat except it's too locally ubiquitous to reasonably avoid, and what non-meat things also tend to be excluded vary widely. (If you worry about cruelty to or exploitation of animals, things like milk or honey may be out; a religious prohibition may allow meat that hasn't been explicitly killed for consumption but disallow, say, onions ... and now I'm thinking about 'too ubiquitous/necessary to the local diet to avoid', I'm also thinking of 'too tasty to do without' and I want to go and look up all the medieval barnacle geese etc, which are such fun, but also not what I should be doing with my time right now). I've found it a not infrequent problem when people are travelling - they don't realise that what is on offer as vegetarian may be quite different to what they would mean by the term.