You have five options for your project: 1) wheat; 2) meat (most importantly, pork); 3) tea; 4) spices; 5) fermentation; 6) ethnic foods.
On this page you can find recommendations for entry points to the cultural component of your project. Depending on the aspect to your chosen food stuff you are interested in, consider looking for photographs, news, trade reports, and more.
As you search for information on your chosen culinary focus (e.g., wheat or tea) make sure to look for visual representations (e.g., paintings) and ephemera (e.g., cooking implements) associated with your commodity. Know how it was depicted, cooked, consumed, and used.