Which ingredient is commonly used to make croquettes?

The ingredient that is commonly used to make croquettes is potatoes. Croquettes are a versatile dish that can consist of various fillings shaped into small patties or bites, which are then coated in breadcrumbs and typically fried or baked. Potato croquettes are particularly popular due to the creamy texture and neutral taste that potatoes provide, allowing them to easily pair with a wide range of ingredients, such as cheese, vegetables, or meats.

While piquillo peppers, fish, and rice can be used in croquette recipes, they are not the traditional or most common base ingredient. Piquillo peppers can serve as a flavorful filling or component in some croquette varieties but are less common than potatoes. Fish croquettes are also well-known and often found in specific cuisine, but again, they are not the most traditional choice. Rice can be part of different types of croquettes, particularly in certain cultural variations, but it is not as commonly associated with this dish as potatoes are.