This recipe for warm warabi mochi, with its uniquely smooth and melt-in-your-mouth texture, is perfect for winter. It's easy to make using just potato starch, sugar, and water, stirring constantly in a small pot over low to medium heat until it becomes thick and smooth. While it becomes chewy and springy when chilled, eating it warm with kinako (roasted soybean flour) and brown sugar syrup offers a melt-in-your-mouth experience. It's so easy to make, it's perfect for a home café treat.