Brenntar or Habermus or Schwarzer Brei is a Swabian staple foodstuff, particularly prominent in the Swabian Jura and in the Allgäu. It is made of roasted flour, usually spelt flour or oat flour. This kiln-dried flour is called Musmehl. It is usually cooked like a porridge with water and milk.
The name Brenntar means "burned porridge", and Schwarzer Brei means "black porridge". If roasted correctly, however, Brenntar is brown, but if roasted for too long in the drying kiln it can turn black.