The primary ingredient in a traditional pierogi is dough made from flour and water, which may include eggs for richness. This dough is typically rolled out and filled with various ingredients to create a dumpling-like dish. Common fillings include mashed potatoes, cheese, sauerkraut, meat, or fruit, depending on regional variations and personal preferences. Pierogi are often boiled or pan-fried, resulting in a comforting and versatile dish celebrated in Polish cuisine and beyond. They can be served with toppings such as sour cream, onions, or butter for added flavor.