The Yam Tree

After long journeys around the world two friends met up to share their amazing experiences.
The first said that he had been in a country where there was a yam tree so huge it could shade 500 riders and horses under just one leaf of that tree.
Having listened to that story the second person recounted a story of a huge pot factory where 2,500 people were needed to make just one pot; 1000 working on the top, 1000 working around the pot and another 500 working inside.
Hearing this the first friend said he didn't believe it and started to laugh and tease his friend.
"What's the purpose of such a large pot" he asked.
"To boil the yam from your yam tree" his friend replied.
VAJIRA