What is the fine-grained topic of the following text: Born in northern India (or in Pakistan, Iran, or Iraq) more than 5000 years ago, it’s one of the oldest grills on Planet Barbecue, and one of the most ubiquitous—with versions turning up in places as far flung as Morocco, Turkey, and Uzbekistan. Only return the topic.
History and global ubiquity of barbecue grills.