Instructions
Buy a holly bush seed from Costolot's General Store for 7 chocolate coins and grow the plant to maturity or purchase a holly berry from the store for 30 chocolate coins and place it in your garden.
Press the "X" button. Enter the village then select Bart's Exchange.
Select the bronze, silver or gold tinkering ticket.
Travel to the location of the holly berry in your garden. Highlight the holly berry and press the "A" button to tinker it, then press the "Back" button to return to your garden. Bart enters the garden and transforms the holly berry into figgy pudding.