Lao Gan Ma Preserved Black Beans in Chilli Oil 280g. Lao Gan Ma's Preserved Black Beans in Chilli Oil will bring a delicious and spicy kick to any meal. Their 280g jar has a strong aroma and flavour, perfect for enhancing the taste of your favorite dishes. This oil is made from an all-natural blend of black beans and chilli, perfect for adding an extra zing to stir-fries, soups, and more. Enjoy!