Sauté leek in a little olive oil and set aside to cool.

Combine ground beef, rice, seasonings, parsley, and eggs. Add in the leeks.

In a separate bowl, combine all tomato sauce ingredients. Add four tablespoons of this mixture to the meat filling.

Core the cabbage and boil for 6-10 minutes, removing the leaves (with two forks) as they soften.

Clean and check cabbage for bugs. With the rib facing toward you, carefully trim it for more flexibility, then make a slit on the bottom.

Using a two-ounce cookie scoop, place meat mixture in center of a cabbage leaf. Roll cabbage over the meat, fold in the sides of the leaf, and then roll it the rest of the way. Continue until the meat filling is used up. (Use a second cabbage if needed.) 

Place finished rolls in a pan covered with more of the tomato sauce mixture. Pack them in tightly so that they stay rolled. 

Cover cabbage with lots of sauce. Place in oven covered on 350 degrees Fahrenheit for two and a half hours, or keep it in the oven on 210 to 220 degrees Fahrenheit overnight.