In a medium saucepan over medium heat, bring 2 inches of water to a boil. Place the chopped apples into a steamer basket over the boiling water, cover and steam for 8-9 minutes or until tender when pricked with a fork. Place the kale over the apples, cover and steam for an additional 1-2 minutes or until the kale is just wilted. Let cool slightly. Reserve steamer water.
Place all of the ingredients into a blender or food processor and puree for 1-2 minutes or until completely smooth. If your puree is too thick, add in the reserved steamer water, breast milk, formula or water into the blender in 1/4 cup incraments until you achieve your desired texture. I had to use 1/2 cup of reserved steamer water for the puree featured above, but amounts of added liquid will vary with each batch.
Serve to baby or freeze for another meal.