Ristorante Pizzeria La Tinaia in Forio is one of the most popular pizzeria on the island. Here you'll find both locals and tourists and the pizza are delicious.
It has a cozy atmosphere and the restaurant is very simple. It's one of those places where the ambience is ok, but the food is incredible.
Aside from pizza, you can also find many appetizers, bruschette, pasta, meat and fish
The prices are incredibly low, and you can expect to pay between 10/20€ per person for.
I would highly recommend it if you are in Forio.