"https://en.wikipedia.org/wiki/Fasnacht_(doughnut)"  : Fasnacht or Fastnacht most distinctly does not mean "donut," at least not in German. It is the name of the day before Ash Wednesday, in other words Shrove Tuesday or Mardi Gras. Please see

  https://dict.leo.org/german-english/fastnacht

or wikipedia's own page about the holiday

  https://en.wikipedia.org/wiki/Swabian-Alemannic_Fastnacht