Wash the red cabbage well. Slice it thinly using a sharp knife. Peel and slice the apple. Cut the onion into thin slices. Keep all ingredients ready before cooking. This helps the process move smoothly.

Heat butter in a large pot over medium heat. Add sliced onion and cook until soft. Stir gently to avoid burning. The onion should become slightly golden and fragrant.

Add shredded cabbage to the pot. Mix well with onions. Add sliced apple and stir again. Cook for a few minutes until everything starts to soften and blend together nicely.

Sprinkle brown sugar, salt, black pepper, and cinnamon. Pour in vinegar and water. Mix everything well. These ingredients give the dish its sweet and tangy flavor.

Cover the pot with a lid. Let it cook on low heat for 30–40 minutes. Stir occasionally to prevent sticking. The cabbage will become soft and rich in flavor.

Taste the cabbage and adjust seasoning if needed. Remove from heat once soft and glossy. Serve warm as a side dish. The smell and color will make it very inviting.