Wash the cabbage thoroughly and cut it into bite-sized pieces.
Dice the Spam into cubes.
Julienne the onion.
Heat oil in a pan and fry the Spam until it turns golden brown.
Add the onion to the Spam and stir-fry.
When the onion becomes translucent, add the cabbage and stir-fry quickly over high heat.
Season with salt and pepper to taste.
Finish by drizzling sesame oil if desired.