A pepperoncini is also known as a peperoncini. These peppers are often used on sandwiches, in salads, on pizzas, and on their own as a snack. The pepper is a species of the Capsicum annuum. Some other species include bell peppers and Italian sweet peppers. How you pronounce pepperonchini depends on where you are from, because everyone has their own way of pronouncing it. The two most common pronunciations of pepperoncini are 'pepper - ohn - cheen- ee' and 'pepper-chini'.