rosti

/R AO1 S T IY0/
noun
  1. 1

    A traditional breakfast dish in Germanophone Switzerland (originally from Bern canton) made from potatoes, fried in a pan with butter or fat and widely varying other ingredients such as bacon, onions, cheese, apples or fresh herbs.

    The border between German- and French-speaking Switzerland is known as the “Röstigraben” because only the first traditionally serves rösti at breakfast.

Source: https://en.wiktionary.org/wiki/r%C3%B6sti, https://en.wiktionary.org/wiki/rosti