The Cooking Pit is the seventh puzzle in Virtual Villagers 4.
The requirement to solve: Level 2 Construction.
Look for an area covered in rocks next to two palm trees at the southwest corner of the screen.
Drag an adult there to remove the rocks.
You can use more than one villager to speed up the process.
Once the area is cleared you need to move four hot stones to it.
Make sure you use more than one villager because if you are too slow the stone will cool down and you will have to restart the process.
Drag an adult to the banana tree located between the blackberry bush and the bridge. They will put leaves on the pit until it is activated.
Now you can drag adults to the fruit trees.