If you are visiting Monterosso al Mare and want to try some traditional delicacies, then head to Massimo della Focaccia. It's a bakery located right outside the station of Monterosso al Mare.
I recommend trying the typical Ligurian Focaccia, which is plain focaccia with a lot of oil. But any type of focaccia is great! Best thing is that you can eat your focaccia with the incredible sea view right outside the bakery.