Time Out says
For a different kind of sandwich experience, try a Chilean chacarero. This Downtown Crossing spot serves them fresh — homemade bread stuffed with grilled or BBQ meat (beef or chicken) or veggies then topped with muenster cheese, green beans, and tomato. The limited menu includes empanadas, oven fried potatoes, and a few desserts. It's counter service, fast, and always fresh, so you'll be in and out with a filling sandwich in a jiffy.