Caramelizing the cabbage leaves before making the soup brings out its sweet undertones, cuts down on their unpleasant bitterness, and makes them more savory and sweet.
To achieve the best results, thinly slice the cabbage to maximize the surface area, as each shred should brown on both sides to form an appealing golden-brown color.
Heat a pan over medium-high heat, then add oil, cabbage, and a good amount of salt. Add a little liquid to the pan to scrape up the crusty brown bits and mix them into the cabbage.