These fermented cabbage heads will produce the tastiest leaves for making cabbage rolls of any kind.  Euro Gourmet develops a tangy taste that has hints of lemon, but are no where near as strong as sauerkraut made with shredded leaves also have a hint of whatever herbs and spices you add to the fermenting liquid for a really rich flavor.  Do be mindful of the fact that they will also have a bit of salt in them so you will want to adjust any recipe accordingly.
Sauerkraut Traditi Romanesti