Fetish - The Dutch corrupted Portuguese word for "Something fake to which special powers are attributed" (Feitiço).
So, starting there, let's dive into what a Ananás piece can provide to a ham and cheese pizza pie. Ananás, and it's juice are fantastic destroyers of fat. It's sweet flavor opens up the palate to the savory of the ham and the cheese, creating a contrast that enhances both flavors taking it into the realms of Umami. Not only that, the fat from both the ham and the cheese is digested way faster, becoming less problematic to the liver and intestines.
Adding both facts, just one piece of Ananás is enough to elevate a normal, boring, fat pizza to Umami levels, there fore, the answer to the question is: ONE.
To those that don't like it, I can only offer my most sincere commiserations for what, either your education or your genetic background, doesn't allow you to experiment.
Welcome to my Fat Talk.
Peace