In a perfect world, you’d eat that onigiri within 24 hours of making it. This is the golden window where the rice is still pleasantly chewy, not rock-hard or drying out. Pushing it to 48 hours is possible, but you’ll notice a decline in texture and flavor. The fridge is a cruel mistress for rice, sucking the moisture right out of those delicate grains.
The real enemy here isn’t spoilage as much as it is starch retrogradation. That’s the science term for what happens when cooked rice sits in cold air: the starch molecules recrystallize, turning soft, fluffy rice into something resembling a dry, chalky brick. Your fridge accelerates this process faster than room temperature would, which is ironic.
