I started to compile this list, but you should check out a professional publication of restaurants here: https://en.visitturku.fi/eat-and-drink
Pizzeria Via Tribunali - First on the list as it's Patrizio's favorite pizza in Finland.
Ristorante Pizzeria Dennis - This used to be our go to every summer. Finnish take on pizza, including pinapple. You've been warned.
Blanko - a regular summer stop for us. Excellent location and great people watching. You can reserve to sit inside or the outdoor tables are first come, first serve. This is an outdoor spot you can just go for a drink too!
Tintå - Around the corner from Blanko, also great outdoor seating/people watching.
Mami
Tårget - This restaurant has a huge outdoor space, and we've often met up here with friend groups in the summer. It's easier to get a table especially with a group, due to size of outdoor space.