Open 6 days a week (closed on Saturdays), La Trailita (it’s a food truck, but before their current truck, they were just a small trailer) serves some of the best tacos and quesadillas in Chicago, including tons of vegetarian options. They are open year round (even when it gets cold!). There is another taco truck across the street at the intersection, so make sure you’re going to the right one (it’s in front of a convenience store). I believe it’s run by some ladies from the church it parks near. Recommend their tacos al pastor and potato quesadillas. Salsa is very tasty but very spicy!