Choripanes are signature sausage sandwiches native to Argentina. Sold by street vendors, at restaurants, and commonly prepared at home, they can be served as an appetizer or entree and are both incredibly simple and incredibly delicious. Choripanes consist of grilled chorizo sausage (often butterflied before being cooked, as we do here) served on bread, slathered with plenty of fresh chimichurri. The bread this simple sandwich is made with varies by region, but hot dog buns, other small rolls, and split baguettes are all commonly used. Use any leftovers of this bright, herbaceous chimichurri sauce to liven up any number of grilled proteins, veggies, or sandwiches.