Why do the Uchidas come to think of dried prunes as a treat?

The Uchidas come to think of dried Prunes as a treat due to their association with comfort and nostalgia. As they face challenges and hardships, the sweetness and richness of the prunes evoke positive memories and a sense of indulgence. Additionally, the limited availability of other snacks during tough times enhances the prunes' appeal, transforming them from a simple food item into a cherished treat.