I make what my family calls "Lazy Golumpki" but not in a crock pot, it is finished in the oven. Here is the "recipe" if you want to try it in the CP.
bacon fat (or oil)
ground beef (or any ground meat mixture)
cooked white rice
salt and pepper
Cook the ground beef until done, drain and set aside.
Par-boil the rice, drain and set aside (you want it only partially cooked since it will cook more in the assembled dish.)
In a LARGE skillet, heat the oil and saute the onion then add the shredded cabbage, salt and pepper and cook until the cabbage begins to soften.
Preheat the oven to 350 degrees.
Mix the cabbage, rice, ground beef and stewed tomatoes together. Taste and season as needed. Put the mixture in a LARGE casserole or baking dish, cover and bake for 45 - 60 minutes.
This is my Gram's recipe and she "cooks by site" and that's how I learned to make this dish so I can't really give amounts. It also depends on how large the head of cabbage is and whether you are more of a filling person or cabbage person.