Well, spam and sauerkraut works as a combination.
I was all set to have pot roast today. Every Christmas, my sister sends me a giant box of Omaha Steak stuff, which is surprisingly good. I've never had a bad product*. Irritatingly, 90% of the stuff comes as "do not thaw, cook from frozen", but around 10% requires thawing overnight in the fridge first. This stupid pot roast required thawing, and I only saw it an hour before I was gonna cook it, so I had to come up with a new lunch plan.
I have been on a sauerkraut and ham kick lately. Sauerkraut and ham on bread is a South German staple on Christmas Eve. I have been making it a few times since this last Christmas Eve, and figured, "Hey, since I already baked bread this morning for the pot roast, I'll do that instead". Only I don't have ham here. I've got a ton of spam though, so experimented. It's surprisingly good.
My folks would shake their heads if they were still alive, but rather than use the usual cooked sauerkraut recipe (which is kinda bland) from our region of Southern Germany, I used a generally Bavarian version. You cut a bunch of bacon into small slices, like for making beef boogaloo, and cook that in a frying pan. Keep all the bacon and grease in the pan. Drain sauerkraut really well (like press the juice out of it) and drop it in the pan with the bacon and grease, and let that grease really mix up with the kraut. Then add some thinly sliced apple, and a small amount of thinly sliced sweet onion. Now fry up the spam. Cut off a slice (or two) from the warm out of the oven bread and spread butter on it. Put a layer of spam on top. Put a layer of kraut on top. Eat as an open-faced sandwich. Yum!
I looked on the interwebz, and apparently "spam Reuben sandwiches" are a thing too.
* I crack up because in five years of sending me a variety box with like 8-10 items in it, she has never once actually included steak. From Omaha Steaks.