With its slightly tart accent and caraway seasoning, braised red cabbage is an excellent foil to the richness of the roast pork.
Heat oil in a large pot or Dutch oven over medium heat. Add onions and cook, stirring, until the onions start to turn golden, about 8 minutes. Add cabbage and cook, stirring occasionally, until the cabbage wilts, about 5 minutes. Stir in broth, caraway seeds and sugar; bring to a simmer. Cover and cook over low heat until very tender, 15 to 20 minutes.
Uncover and stir in vinegar. Increase heat to high, and cook, stirring occasionally, until most of the liquid has evaporated, 8 to 10 minutes. Season with salt and pepper.
Make Ahead Tip: Cover and refrigerate for up to 2 days. Reheat gently over low heat or in the microwave.