01 - In a large pot, heat the olive oil over medium heat. Add the chopped onion and sauté until translucent, about 5 minutes.
02 - Add the shredded red cabbage and sliced apple to the pot, stirring well to combine.
03 - Pour in the apple cider vinegar and water, then add the brown sugar, salt, pepper, and cinnamon.
04 - Bring the mixture to a simmer, then cover and reduce the heat to low. Cook for 30-35 minutes, stirring occasionally, until the cabbage is tender.
05 - Adjust seasoning if necessary, then serve warm or at room temperature.