GRRrrr!

Got the little buggers.
I had a flock of molluscs, lurking in the undergrowth and charging out after dark to guzzle me Kale.
I'm most emphatically not a fan of Slug Pellets, but have been known to employ them de temps en temps. And this was one of those temps.
The two on the right had been reduced to single stalks before I spotted the damage.
More by good luck than management they little buggers had managed to avoid the meristem region, so  - we have:-
On the left:- what Cavolo nero unmolested looks like
 Centre & right:- What they developed into after the slug slaying.
Leeks aren't doing too bad either.