The phrase "addition of kale" means including or putting kale into something else.
Sentences with «addition of kale»
The addition of kale to the filling makes it a little greener and more substantial and the pieces on top crisps up into chips. (greenkitchenstories.com)
Thanks for sharing, loved the addition of kale in here, as cold as it is, other kinds of salads are not so inspiring these days. (101cookbooks.com)
I love the addition of the kale and that butternut squash sauce sounds soooo delicious! (adishofdailylife.com)