You can also create custom smelting recipes to add interesting mechanics to your server, for example:
cup_of_hot_water:#example itemenabled:truepermission:cup_of_hot_watermodel_id:5name:'&fCup of hot water'smelting:enabled:trueingredient:cup_of_water#ingredient to be smelt/cookedamount:1#result amount (cup_of_hot_water)