A type of pletzel smothered in onion and poppy seeds is known as the onion pletzl, onion board or onion flat in the US. It was a common treat sold in American Jewish bakeries until the end of the 20th century.[1][2]
^Gil Marks. Encyclopedia of Jewish Food. John Wiley and Sons, Hoboken NJ 2010, ISBN978-0-470-39130-3, p. 470
^Jeffrey Hertzberg, Zoe Francois. Five Minute Bread: The revolutionary new baking method: no bread machine, no kneading! Random House, 2016. ISBN9781446446683, p. 250
