At all colleges, students dine with teachers, and if you’re invited by either, the public can too; in the largest, oldest dining room, the Schwarzman Center, anyone can walk into the Commons and pay for a meal, including Persian-spiced rotisserie chicken, saffron-butter potatoes, roasted tomato with feta, pork with black bean sauce, spicy noodle salad, stir-fries, Chinese dumplings and hot chocolate chip cookies.