Chop the scallions and onion, cube the spam, and scramble the eggs. Set these aside.
Place the pan on high heat, add oil, and saute the scallions and onion until fragrant.
Add spam and saute until slightly toasted and crisp.
Add rice, season with soy sauce, oyster sauce, sesame oil, and butter on top, then mix well.
Add egg, then mix well.
Taste and adjust using salt and pepper.
Plate and garnish with sunny-side-up egg, scallions, and sesame seeds.