This classic sweet and sour chicken recipe is a homemade version of the popular Chinese takeout dish. Tender chunks of chicken are coated in a crispy batter and then tossed in a tangy sauce made with vinegar, ketchup, sugar, and soy sauce. The chicken is stir-fried with bell peppers, onions, and pineapple chunks for a burst of flavor and texture. Serve this delicious dish over steamed rice for a complete meal that the whole family will love.