For those who like a little heat in their sweet and sour chicken, this spicy version is sure to satisfy your taste buds. The chicken is marinated in a spicy sauce made with chili paste, soy sauce, ginger, and garlic, then coated in a light batter and deep-fried until crispy. The sauce is made with a combination of vinegar, ketchup, sugar, and soy sauce, with an added kick from chili flakes or hot sauce. The result is a deliciously spicy and tangy dish that will leave you craving for more.