1 tablespoon extra-virgin olive oil
1 large red onion, halved and sliced
1 pound apples (about 2), cored and cut into bite-size pieces
2 teaspoons apple cider vinegar
Sea salt and freshly ground black pepper, to taste
1 bunch kale, well rinsed
We Like The Flavor And Firm Texture Of Honeycrisp Apples In This Quick SautÃ©, But Other Crunchy, Sweet-tart Varieties Such As Galas Or Braeburns Will Work Too.