Start with your filling. Soak the dried mushrooms with boiling water in a bowl for 30-40 mins until soft. Cut the onion and garlic into very small pieces and add them to your medium heated pan without any oil, let them get to the point where they are almost burnt, but not too much.(just to have an ever smokier flavor). Meanwhile, blanch your kale for 5 minutes in another pan on a medium heat, without adding any salt to not lose its color.