That would be awesome! You could set it to accept stones of any kind and give players some starting stones. They could trade them for food and if they run into hard times later, come back with more stone to trade. Give only 1 or 2 kinds of food so people are not discouraged from running their own farms later on. Maybe one kind of vegetable and one kind of protein or just ready made sandwiches? Not grain and not fruit that allows to make alcohol/vinegar, that would be too OP.