Chicago’s unassuming lone Costa Rican eatery turns out burritos bursting with chicken, black beans and fresh avocado, and sandwiches dressed in a heavenly, spicy-sweet vegetable sauce. Wash them down with an avena (a slurpable oatmeal milkshake). For breakfast, the arroz con huevos (peppery eggs scrambled into rice) relieves hangovers. Irazu is BYOB with no corkage fee. Cash only.