We should follow the example that Sustainability.SE set on their on-topic page in the FAQ and provide useful recommendations for other sites in the StackExchange network that might be more appropriate for questions that are barely on topic. Currently our on-topic page is very light on details. So let's identify sites that are likely to overlap with ours and amend our FAQ.
Respond to this question with suggestions for sites that are likely to overlap enough with Vegetarianism that we sometimes see misplaced questions on this site. Each answer should ideally be supported with one example of a question that would have been more at home on another site.
Note: This post originally requested changes to the screen that appears when closing questions as Off-Topic/Migration, but moderators do not have access to change that and it can only be changed by SE admins and that's only done in very rare cases.