In a separate bowl, add the pumpkin puree, eggs, nutmeg, cinnamon, salt and milk. Mix it until it becomes smooth.
Open and unlock the multicooker lid by turning the handle to the unlock position. Pour the mixture into the pot then close and lock the lid by turning the handle to the lock position.
Press the [MENU SELECTION] button and select the [STEAM] function. Set the cooking time for 30 minutes and temperature level 3 then press [COOK].
In a separate bowl, add butter, graham cracker and walnut. Mix it together.
Once the cooking is done, move the mixture into a bowl and top it with graham cracker mix.