Are you only interested in the smoker portion of the food business? If not, offer to purchase all the food services from him. Possibly rent the space from him, but then you control the food. Or offer to purchase a fair interest in the food portion of the business.
I honestly don't see how he would want to partner with you if you only wanted to be involved in the BBQ portion of the business. I know some very good partnerships that own and operate a restaurants, but all the food that is produced is part of that partnership. One isn't saying, the BBQ is mine, and the chicken fried steak is yours. They are both in it to maximize profits.