Could also be a good way to reduce food waste. If you buy a bunch of ingredients for one dish and have some left over you probably won't use right away why not share them? I definitely have some spices I've bought and haven't touched in years but it could also work for stuff that has short shelf lives like produce.
I think a good mixer opportunity to get your foot with your neighbours and plant the seed for this idea would be when people move in or during emergencies like power outages.