Okayu, also known as rice porridge, is a comforting and nourishing dish commonly eaten in Japan. It is made by simmering rice in water or broth until it becomes soft and creamy. Okayu is often served as a simple and soothing meal for those who are feeling unwell or as a breakfast dish. It can be enjoyed plain or topped with various ingredients such as pickles, seaweed, or cooked vegetables.