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1
Beat egg in a large bowl. Mix all-purpose flour and 1 1/2 tablespoons corn flour into egg until batter is smooth; season with salt and pepper. Dip chicken into batter, working in batches, until coated; place on a plate in a single layer so the pieces do not touch.
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2
Heat a skillet over medium-high heat; add enough vegetable oil to reach about 1/2-inch depth. Fry battered chicken, working in batches, in the hot oil until no longer pink in the center, 5 to 10 minutes. Transfer cooked chicken, using a slotted spoon, to a paper towel-lined plate to drain.
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3
Heat 2 tablespoons vegetable oil in skillet over medium heat; cook and stir ginger and garlic until lightly browned, 1 to 2 minutes. Add cilantro and serrano peppers; reduce heat to medium-low.
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4
Mix chicken stock, soy sauce, sugar, 1/4 teaspoon black pepper, and monosodium glutamate into garlic-ginger mixture; cook and stir until sauce is heated through, about 5 minutes. Add green bell pepper to sauce and cook until slightly tender, 2 to 3 minutes.
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5
Whisk water and 2 tablespoons corn flour together in a bowl until smooth; stir into sauce until incorporated. Bring sauce to a boil. Add chicken and stir to coat.
