What ingredient in Hawaiian pizza is said to be frowned upon in Italy?

No pizza topping has ever divided pizza lovers like pineapple. While some swear by pineapple on their pizza, others have launched a crusade against the very idea of putting the sweet and tangy fruit on something cheesy and saucy like a pizza. It’s safe to say that most Italians would be part of the second camp. When you eat pizza in Italy, you just won’t find pineapple as an option on the menu. Whether you want to order ham and pineapple or barbecue chicken and pineapple, Italy is not the place to find it.

Source: The Travel