You may want to retrieve all the comments from a user, or the comments about hotdogs in all restaurant, or all the comments about all type of food in a restaurant so I would recommend to do it like :
1. user-[:write]->comment
2. comment-[:about]->hotdog
3. comment-[:concern]->restaurant
4.restaurant-[serve]->hotdog
Not sure about the last one it may be useless due to 2 and 3, it depend a lot on the queries you'll run