That bad boy poking out of his Styrofoam cup is huge shrimp with extra-long whiskers, floating in piping hot soup with diced potato and carrot, size chico, at the always-packed El Caguamo sidewalk mariscos stand on Ayuntamiento and Lopez streets. At 25 pesos, their spicy and savory caldo de camaron is a cheap between-meals snack or a most potent hang-over cure. (Emphasis on the "potent hang-over cure" phrase of the previous sentence.)
Everything at El Caguamo in fact is delicious and priced just right: The empanadas de camaron are especially recommended.