Breaking bread is a tradition thousands of years old. It can build new relationships and super charge existing ones.
Loosely, I divide the conversation at a business dinner like this:
Before the dinner order/wait for food: catch up on family, personal life
Food arrives: Talk about the business/problem/oppty at hand
After dinner: The future- travel or promotion or anything the other person is looking forward to.
I grab the check, shake hands and send them on their way with a full belly and (hopefully) a full heart.
Hope this is helpful to you. Good luck out there!