Homey, family-run Papa's is a favorite of the local Puerto Rican community. Specialties are roasted chicken (as you can see from the birds slow-turning on spits) and jibarito sandwiches (garlic-mayo-slathered steak or chicken between slices of fried plantain 'bread'). The jibarito is a Chicago invention, and Papa's small, island-y cafe is a terrific place to try one. BYOB.
The restaurant will make a vegetarian version, with fried tomatoes and peppers, for those who don't eat meat.