Sort:  

Ohhhhh sounds good! We used to grow in a garden I remember but I don't remember what for. My mum didn't cook it. It had such pretty leaves we used to use it for plates decorations and it always had lots of caterpillars on it! After the summer chickens we eating it :p They loved it!

Why it needs a frosty night? Loses bitterness or something?

The cold increases the sugar content in the leaves of kale and the softening cell structure makes it easier to digest.

Ahhh I didn't know :)