Heat a wok pan (or non-stick skillet), over medium high heat, until very hot, about 2-3 minutes.
Add the oil and sauté the bacon until golden brown but not yet crispy, about 4-5 minutes. If the bacon has rendered too much fat, drain most of it, leaving in the wok just 2 or 3 tablespoons.
Add the onions and scallion, sautéing until softened, about 2-3 minutes. Then, add the minced garlic and sauté for a minute, until fragrant.
Push the bacon and onion mixture to the sides, forming a hole in the middle. Crack the eggs and stir to scramble them. Cook the eggs for 30 seconds to a minute, until just almost done. Then, stir to combine with the bacon and onions.
Add the frozen peas and stir to combine. Cook until no longer frozen, about 2 minutes.
Stir in the chilled rice, tossing to mix with the other ingredients. Stir-fry for 4-5 minutes, without stirring too much so the rice has a chance to crisp up. You can also gently flatten using a spoon or spatula, so the rice has a chance to interact with the hot pan.
Pour in the soy sauce and season with freshly ground pepper, stirring so all the grains are coated with the sauce.
Drizzle the sesame oil and serve immediately, garnished with more sliced scallions.