Brotsuppe

Bread soup is a simple soup that mainly consists of stale bread. Variations exist in many countries, and it is often eaten during Lent. Both brown and white bread may be used. The basis for bread soup is traditionally either meat soup or vegetable broth. Less often it is made with fish broth. To prepare the dish, the bread is either cut into pieces and put directly into the broth, or it is cooked with onions and spices in a broth and then pureed.

Source: Wikipedia