Once you have run out of leaves, make the sauce for the top of the cabbage rolls.
Take the remaining carrot and onion mixture in a saucepan over medium-high heat and add the sour cream, tomato sauce, margarine, Vegeta spices, and boiling water.
Once the sauce is boiling and thickened (approximately 3-5 minutes), pour generously over the cabbage rolls.
Cover the cabbage rolls and bake for one hour.
Check the rolls to make sure they are cooked through, then allow them to cool for 20 minutes before serving.
Serve with sour cream and your choice of side and enjoy!