Start by heating your cast-iron skillet over high heat until it’s very hot, almost shimmering. Add 1 tablespoon of oil and swirl to coat the surface.
Add the shrimp to the hot pan in a single layer. Cook for about 1-2 minutes, tossing or stirring until they turn pink and are just cooked through. Remove the shrimp from the pan and set aside.
Pour the beaten eggs into the same pan, letting them spread out. Let sit for about 15-20 seconds, then scramble gently with your spatula until just set and slightly fluffy. Remove and set aside.
Add another tablespoon of oil to the hot pan. Toss in the minced garlic and cook for about 30 seconds, until fragrant and slightly golden, filling the air with aroma.
Add the cold, day-old rice to the pan. Break up any clumps with your spatula, stirring quickly for about 3-4 minutes until the rice is heated through and starting to char in spots, giving it that smoky, slightly crispy texture.
Push the rice to one side of the skillet. Pour the scrambled eggs into the empty space, letting them cook for about 30 seconds before gently folding them into the rice, distributing evenly.
Return the cooked shrimp to the pan. Drizzle soy sauce evenly over the mixture, tossing everything together quickly to coat and cook for another minute, allowing the flavors to meld and the rice to develop a smoky aroma.
Add the sliced scallions and a teaspoon of sesame oil if using. Toss briefly, just until the scallions soften slightly and release their fresh aroma.
Taste the fried rice and season with salt and white pepper as needed. Continue tossing for 1 minute to ensure everything is evenly flavored and hot.
Turn off the heat and let the fried rice sit for a minute. This helps the flavors settle and slightly crisp the edges for that authentic smoky texture.
Serve the shrimp fried rice hot straight from the pan, garnished with extra scallions if desired, and enjoy that flavorful, smoky aroma with every bite.