Boil 2 heads of cabbage until they get soft (about 30-40minutes). Once done, strain, then cut around the root of the cabbage. Cut cabbage in half then cut in slices to chop into cubes.
In a bowl (you may need to split into 2 bowls since it is a big mixture). Mix the rice, ground meat, cubed onions, seven spices, sumac, minced garlic, salt, black pepper, oil and lemon. Then add the cubed cabbage and mix well.
Add the stuffing into a big pot and pour the juice mixture, mix over high heat. Once water boils cover and simmer for 40-45minutes.