The ancient Mayans had a unique built-in fruit and vegetable storage system in their kitchens known as a 'chultun'. A chultun was an underground storage chamber made of stone or clay. These chambers were designed to maintain a cool and dry environment, perfect for storing fruits and vegetables. The Mayans also used woven baskets and pottery vessels to store their produce. The chultun storage system allowed the Mayans to preserve their food for long periods, ensuring a stable food supply in times of scarcity.