ah, yet another instance of Makaton not having a sign that's needed rather frequently but individual signs for roti, chappati and naan bread! (now I like to eat all those three - but don't often need to discuss them with dd!)
In my big 'complete Makaton vocabulary' there's is also no sign for grapes (evidently a highly exotic foodstuff) and other common fruits. Mad, mad, mad.
Sorry, can't check whether 'share' is in there, though I suspect not. The book's at school.