In a large pan over MEDIUM-HIGH heat, add the extra virgin olive oil and unsalted butter. Once the butter melts and the bottom of the pan has been coated, add the diced onions and saute for 5 minutes, stirring occasionally. Add the garlic and saute for another 1 minute. Add the shredded cabbage, salt, black pepper, and cayenne pepper and continue to saute for 10-15 minutes, or until the cabbage and onions have browned and caramelized.
Remove the pan from the heat and stir in the Apple Cider Vinegar. Taste and add more salt and pepper, if needed. Enjoy!
Notes
I have also used angel hair cabbage for this recipe, as well. It's typically a 10-oz bag of pre-shredded cabbage that is supposed to be used for making coleslaw. This is a great tip to use if you don't want or have time to shred the cabbage yourself. If you're using this option, you'd use the entire bag of shredded cabbage.