1. Clean the black beans and cook in a pressure cooker with 2 cups (500ml) water for 20 minutes over the medium heat and drain in a colander. 2. Combine soya sauce, sugar and salt in a medium pot. Cook until the sugar dissolves, about 5 minutes. Add the black beans and cook another 7 minutes and turn off the heat. Add the sesame seeds and sesame oil and mix well.