This is a very mild filling, inspired by Eastern European recipes that don’t use a lot of seasonings. Therefore, you can use it as a template to make rolls that reflect whatever culinary heritage you like. Here are some seasoning ideas:
Spice it up with red pepper flakes or cayenne, or go in a Louisiana direction by adding some Creole seasoning.
Add chili powder and cumin for southwestern flair.
Make them more like Polish golabki by adding sauerkraut to the sauce or filling.
Throw in some chopped fresh dill or caraway seeds
Give it an Italian twist with oregano and basil.
Go in a Middle Eastern direction by increasing the allspice and adding cinnamon and perhaps some mint (or season like stuffed grape leaves).
*For low-sodium diets, omit the salt and use salt-free canned tomatoes.