Costco had a special this weekend on Bill Bailey's corned beef, a heat-and-eat unsliced chunk of corned beef brisket. I was planning to heat it up when I realized I had a 1 lb bag of shredded cabbage (for coleslaw) that I needed to use.
It's actually very simple. Pour the bag of slaw mix into a large covered casserole dish. Cut the corner off the bag containing the chunk of corned beef and pour the liquid in with the cabbage. Cover the casserole and nuke the cabbage and corned beef juices for 5 minutes on high.
When it comes out, the cabbage will have wilted enough to let you put the chunk of corned beef in, fatty side up. Nestle it in the cabbage and return the dish to the microwave (covered) for 12 minutes per the cooking instructions.
Let it sit for 3 minutes as recommended, then take the corned beef out and slice it against the grain. Nestle the slices back in the cabbage and cover until you're ready to serve.
The cabbage wilts enough so it's not hard, but has a small bit of crunch, and it absorbs lots of flavor from cooking in the juices and with the meat.
My wife and kids gobbled it up, and I had a tasty Sunday dinner that was great for my low-sugar diet.