Ryvita is a rye-based crispbread manufactured by the Ryvita Company. Ryvita is a rye-based crispbread originally manufactured by the Ryvita Company. Celle is the base for a crispbread factory, Barilla Wasa Deutschland. Brunost is mostly used as a topping for sandwiches, crispbread, and biscuits. In the case of unleavened crispbread, bubbles are introduced into the dough mechanically. Sweden's first industrial crispbread bakery, AU Bergmans enka, began its production in Stockholm in 1850. Traditional crispbread was invented about 500 years ago. Pampore is also very famous for crispbread known as 'Shirmaal'. However, in recent years there has been renewed interest in crispbread in the Nordic countries. Crispbread traditionally consists of wholemeal rye flour, salt, and water.