Depends on the size of the species. If they are smaller than the average human, most definitely approach them onto a grill and eat them. If they are larger, that approach is still viable, but their size may be difficult if they are similar in scale to mammoths but have opposable thumbs.
Alternatively, it may be insightful to consider the precedents for this. Leprechauns have lived in civilized secrecy for thousands of years, and gnomes have been documented performing organized crime or acts of violence. Regardless of whether humans are related to either, they would be a distinct species from homo sapiens. It may be the case that for any species on Earth that develops civilization, it ensures approach doesn’t happen.