Spam is not for everyone. However, for those who do appreciate a good bit of ground pig product, spam has a charm that crosses oceans and opens hearts. Spam musubi is one of my favorite ways of consuming spam. This dish is very easy to make so I have not exhaustively photographed all these steps this week. If you have any questions I would love to answer them in the comments section.
TL;DR for Reddit: Spam=Really thick bacon.
I used this recipe to make my spam musubi. The amount of sauce produced by this recipe is excessive I recommend using these proportions (1 part oyster sauce, 1 part soy sauce, 2 parts sugar) to create only as much sauce as you need. I am also not convinced that the oyster sauce is vital to the recipe. It certainly adds another dimension of flavor but I think a simple 50/50 soy sauce and sugar mix would be just as good. Also, I did not marinate the spam prior to cooking because I prefer to fry the spam up before slathering it in sauce.
You could buy one of these to mold your musubi but I am an acolyte of His Holiness and believe that you should avoid buying kitchen gear that only has one use. To that end: Make your own musubi mold. Your spam came in a conveniently shaped container. Saw the bottom off and you have a free musubi mold. I would suggest using a hobby saw to make the cut. I used both a hobby saw and a heavy x-acto blade to make the cuts. The x-acto blade was faster but the cuts were ugly and I had to take extra time to clean it up.