Red sweet and sour cabbage...drain or not?
Red cabbage is usually braised, not boiled.  Following the instructions listed in your recipe, you're going to lose the flavor of the caraway as well.

For German-style sweet and sour red cabbage I typically saute some diced onion and apple in sugar and butter until just golden, add the shredded cabbage and then cook a little until the cabbage is glazed.  Add some beef stock along with red wine vinegar, bay leaf and salt and then braise lightly covered until cabbage has softened. Sprinkle some flour over the top and add add'l beef stock and red wine to this.  At the end, remove from heat and stir in a couple of tablespoons red currant jelly just to mix in and balance the sweet/sour flavors.