
Rinse the shrimp under cold running water. Pat dry with paper towels, then marinate with salt and white pepper for about 15 minutes.
Mix all the ingredients for the Frying Batter until well combined. Add the shrimp to the batter and stir to coat evenly.
To deep-fry the shrimp, heat 2 to 3 inches (5 to 7.5 cm) of oil in a wok or stockpot to 350°F (175°C). Gently drop the shrimp into the oil and use a spatula to loosen them immediately, preventing them from clumping together.
Deep-fry the shrimp until they are light golden brown and the batter is crispy. Remove them with a strainer or slotted spoon, draining the excess oil by placing the shrimp on a wire rack or on a dish lined with paper towels.
To stir-fry, heat the oil in a skillet over high heat. Add the chopped scallion and chili or jalapeño, stirring quickly for a few seconds. Add the fried shrimp to the skillet, followed by the salt and white pepper. Stir to combine all the ingredients well, then dish out and serve immediately.