I know a lot of people like to trade food and what not. You should add some sort of cooking system.
The more you cook, the more recipes you unlock. Could also sell recipes at onnet, nexus, and rev. Could be for cosmetic purposes (House plate furnish), and you could also make them have effects, like the halloween candies.
As for ingredients? Well, whenever you want to add crops, could use those. Later on, if fishing ever gets added, players could start making sushi and what not. Could also have a town where players can sell their food, to avoid scamming. To avoid people from using alt accs and make a ton of money, you can only by 1-3 food items (idk). Thoughts?