Pizza al taglio is sold by weight, cut with scissors, eaten folded in half while walking. This is how Romans do quick lunch, not sitting down for tourist pizza.

Pizzarium near Vatican (Via della Meloria 43) — Creative toppings like mortadella with pistachio. €3-5 per slice depending on toppings. Always crowded with locals which is good sign.

Trapizzino Testaccio — Invented the 'trapizzino' (pizza cone filled with roman classics like pollo alla cacciatora). €3.50-4 each, perfect portion for snack.

Da Remo in Testaccio does traditional Roman thin crust. €2-3 per slice, basic toppings but executed perfectly. Open since 1960s, still family run.

Look for pizza displayed in rectangular trays behind glass, not round pies. Fresh batches come out every 2 hours. Avoid anywhere that reheats old slices.