Answer:
Sauerkraut owes its existence to this head
There was a green house. Inside the green house there was a white house. Inside the white house there was a red house. Inside the red house there were lots of babies. What is it?
What can't you eat for breakfast?
What has green hair, a round red head and a long thin white beard?
There was a little heart inside a little white house, which was inside a little yellow house, which was inside a little brown house, which was inside a little green house.
What is round, has a twin, and sees more than most?
Food
Animal
Difficult
Easy
Funny
Kids
Logic
What am I?