To prepare a sweet onion and pineapple chicken teriyaki recipe, you'll need: Sweet onion: Peel and cut the onion. Cut the pineapple in half lengthwise. Place the sliced pineapple and the chopped onion in the bottom of an 8x8x2-inch baking dish. Pour the soy sauce over the mixture. Cover the dish with plastic wrap and refrigerate for at least 1 hour. Heat the oil over medium-high heat. Add the chicken and cook, turning occasionally, until browned on both sides, about 5 minutes. Remove from the heat and set aside to cool.