Cut tofu and Spam into bite-sized pieces.
Slice the onion and green onion.
Put Spam in a pot and stir-fry to release the oil.
Add onion and green onion, and stir-fry together.
Add gochujang, red pepper powder, soy sauce, and minced garlic, and stir-fry.
Pour in 200ml of water and bring to a boil.
Add tofu and simmer on medium heat for 5 more minutes.