With a very light amount of olive oil, heat a saucepan. Add bacon and wait 3-5 minutes until it begins to crisp. Flip it and cook another 2 minutes. Try to keep all the grease in the pan.
Put bacon pieces on a towel-lined plate and place kale in saucepan filled with bacon grease. Toss the kale around so that all of it gets some of the bacon flavour. Cover the saucepan for 4-5 minutes until the kale starts to reduce. Add three tablespoons of apple cider vinegar and the chicken broth and cook another 3-5 minutes.
Add the bacon, cut up, back into the kale and serve warm.