It can be served warm as well as cold. Traditionally on Christmas Eve, all the dishes should be “lenten” meaning cooked and served without any meat or animal products. Sauerkraut is very healthy, because it includes a huge amount of vitamins C and K. https://www.thespruceeats.com/easy-raw-polish-carrot-salad-recipe-1137325 Polish Sauerkraut Salad with carrots and onions By Marta August 9, 2014. 0. Sauerkraut it is a very popular side dish ingredient in Germany and Poland. It is made of white cabbage which fermatas. Kapusta (Sauerkraut with Mushrooms) – one of my favorite Polish delights – is super healthy and in most Polish houses, served on Christmas Eve.