Mezzo Quinto
Mezzo Quinto sits in the middle of Via Degli Ammirati, which is a great little road to know about as you'll also find Il Pizzicotto, Bar Moro, and ‘00’ here.
If you want a fast bite of hearty local food, you literally couldn't find a better local spot. The core menu: polpette (meatballs), pezzi di cavallo (horsemeat stew), and parmigiana (aubergine) are the classics that generations of salentini have survived on. You can get a panino for 5€ or a plate for around 7.50€, there won't be any frilly bits, just rustic flavour and plenty of it.
If you can't be bothered messing around with restaurants, getting a table, waiting to be served, waiting in general, in Mezzo Quinto you have a quality, local, authentic, and cheap option- what more could you want.