Mercato di Testaccio

A modern covered market with a cluster of food stalls turning out some of the best cheap eats in Rome — supplì, trapizzino, fresh pasta, and produce vendors who've been there for generations.

The market closes mid-afternoon and doesn't open Sundays, so this is a morning-to-early-afternoon stop rather than a dinner option. Late morning through early afternoon is the best window for the food stalls specifically; come earlier if you're there mainly to buy produce rather than eat.