In my experience, I found empowering all of the students by asking them to teach the others something about their background, culture or interest, seems to do the trick. So that they're experts at least in the content, if not at expressing it.
Of course, doing a bit of research on the cultural knowledge as a tutor also helps students to get started, or 'excited' about the topic.
If you throw in a bit of the native language, that is, if you, as the tutor, speak a few words or expressions in the native languages, all helps to break the ice.
If all fails, try food . Whether you make a lesson out of buying the ingredients and cooking as a group, or going to a restaurant together. I'm sure there are plenty of Turkish and Chinese restaurants in your neck of the woods.
Hope this is useful & relevant!
- For Teachers