Pepperoni is the most popular of all pizza toppings in the US. Pepperoni is a kind of dry, hard, salami made generally with pork and beef in the US but in Italy may contain goat, turkey or fish.
In Italian peperone is the name for a type of red bell pepper and if you wanted what we call pepperoni, you would ask for salame piccante.
If you are a pizza purist or just like to make your pizzas from scratch, you might want to try making your own pepperoni. Here are some recipes we found.
About.com Homecooking - caution, you have to be really serious about this endeavor as it takes 6 to 8 weeks of hanging to dry and cure your pepperoni
Recipe4All This appears to be a shortened version of the above
CD Kitchen - A good recipe if you like easy and quick. If I were going to try a first hand at this type of food preparation, this is the one I would go for.
The easiest way of course, is to buy a stick of pepperoni in your supermarket's deli or have it sliced up fresh for you right there. However you decide, pepperoni sizzling on a homebaked pizza is heavenly.