Lefse is a traitional soft Norwegian flatbread made out of potato, milk or cream and flour, and cooked on a griddle. Special tools are available for lefse baking, including long wooden turning sticks and special rolling pins with deep grooves. There are significant regional variations in the way lefse is made and eaten, but it generally resembles a flatbread, although in many parts of Norway, especially Valdres, it is far thinner. In some parts of the United States (such as North Dakota, Minnesota, South Dakota, northern and central Iowa, Wisconsin, and Washington), lefse is available in grocery stores; one Minnesota tortilla factory makes a run of lefse once a month on its tortilla equipment.