Now that you have Puzzle 7 completed, your villagers can cook the hard yellow fruit in the pit to soften it up.

To start the process, take a Farmer and drop them at the tree with the yellow fruit. Their action should say: "Shaking down some fruit!" When the fruit falls to the ground the villager will pick it up and take it to the cooking pit, their action saying "Preparing fruit in cooking pit". When the fruit is done cooking, the villager will pick it up and take it to the food bin, their action will say "Carrying fruit to the food bin". Once the fruit is in the bin it will be "counted."

Do not disturb your villager when they're shaking down, cooking or carrying the fruit. If you do, they will drop the fruit, it'll disappear and they'll have to go shake down another one, cook it and carry it to the bin.