Cut spam into equal sized cubes.
Cook on a med-high heat pan until all sides have been nicely browned.
Add soy sauce, brown sugar, and mirin. Continue stirring for 1-2 minutes until sauce thickens and coats the spam well.
Serve spam on top of rice, top with mayo, an egg, garnish with furikake and green onions.
Bring 3 cups of water up to a boil.
Add 1 cup of room temp water.
Drop egg in water from fridge.
Turn off heat, cover with lid, and leave it for 12-13 minutes.
Immediately place under cold water, and crack in rice bowl.
