Bring oatmeal with water to a boil in a pan and cook it on medium heat for 5 minutes.
In the meantime, rinse and chop the kale. Especially chop the stem parts very small so you can easily pick them with a spoon and chew them once cooked.
Add the kale in slowly and mix it in with the hot oatmeal. There should be enough water left for the kale to go in and reduce. If water is missing, add a little bit, but not too much that it becomes liquid.
After 3-4 minutes, the kale will be reduced in volume and tender enough to be eaten.
Place the contents in a bowl, add the lemon juice, and that's it.