I did corned beef and potatoes, but instead of boiled cabbage I had bacon-fortified sauerkraut. Yuengling rather than Guinness.
I cook my (store bought) corned beef by simmering it at 190-205 for about 3 hours - in addition to the included spice packets I add half a quartered sweet onion, black peppercorns, coriander, mustard seed, whole cloves, a little rosemary, a pinch of cinnamon, and more fresh garlic than most published recipes.
Today, modified & improved Reubens - dark rye, corned beef, bacon-fortified sauerkraut, mayo (rather than Russian or Thousand Island), and Havarti rather than swiss cheese. Sliced dill pickle on the side. Yuengling again.
I have thinly-sliced leftover corned beef wrapped up in sandwich-size portions in the deep freeze for whenever I want a Reuben.