The ancient Vikings had a unique built-in fruit and vegetable storage system in their kitchens known as a 'kelderkast'. A kelderkast was a wooden cabinet with multiple shelves and compartments for storing various food items, including fruits and vegetables. These cabinets were often built into the walls of the kitchen or placed in a cool corner. The Vikings also used woven baskets and clay pots to store their produce. The kelderkast storage system allowed the Vikings to preserve their food for extended periods, even during harsh winters.