Where does “Algengrütze” come from?

Algengrütze (German) comes from German Grütze, from Middle High German grütze, from Old High German gruzzi, from Proto-Germanic *gruti.

Ancestry of “Algengrütze”, step by step

Algengrütze traces back through two separate lines of ancestry.

via German Grütze

StepLanguageWordMeaning
1GermanGrützea food of coarsely ground cereal grains: groat;...
2Middle High Germangrütze
3Old High Germangruzziheap, pile
4Proto-Germanic*gruti

via German Algen

StepLanguageWordMeaning
1GermanAlgenplural of Alge
Every word from Proto-Germanic *gruti