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Season the pieces of chicken with kosher salt and ground black pepper and refrigerate it while preparing the rest of the recipe.
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Combine the sugar, vinegar, pineapple juice and orange food coloring in a medium saucepan. Gradually whisk in 1 ½ cups water and bring to a boil over medium heat, making sure the sugar is dissolved. Make a paste with the ¼ cup cornstarch and ¼ cup water, and whisk it in to the sauce. Let it boil until thickened then take it off the heat.
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Make the batter for the chicken. Whisk together the self rising flour, the 2 tablespoons of cornstarch, 1 teaspoon kosher salt, the white pepper and beaten egg. Add 2 tablespoons of vegetable oil, then slowly whisk in1 ½ cups water. The batter should be like pancake batter. Let is sit while the chicken is in the refrigerator.
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Quickly stir-fry the bell peppers in a little of the vegetable oil in a skillet over high heat. Cook only enough to soften them – they should not get brown. Remove them to paper towels to drain.
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Heat 3 cups of vegetable oil in a wok or large skillet. Combine the seasoned chicken pieces with the batter, stirring to coat each piece completely. Fry the chicken in batches until it is cooked through and the batter is golden. Remove with a slotted spoon and drain on paper towels.
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When all the chicken is ready, layer the green bell peppers and pineapple chunks on a large platter. Arrange the fried chicken over the peppers and pineapple then pour the sweet and sour sauce over everything. Serve hot.