In a small bowl, whisk together cider vinegar, brown sugar, caraway seeds, and celery seeds.

Set the vinegar mixture aside.

Place shredded red cabbage and thinly sliced onion in a saucepan.

Add a small amount of water to the saucepan.

Cover the saucepan and steam the cabbage and onion until tender, approximately 15 minutes.

Add the vinegar mixture to the saucepan with the cabbage and onion.

Toss to coat the cabbage and onion with the vinegar mixture.

Season with salt and pepper to taste.

Serve the sweet and sour red cabbage warm.