The witches oven, made infamous in the tale of Hansel and Gretel, is a very practical device for the would-be witch or warlock. While unable to smelt metals, the oven is particularly good at cooking food and making charcoal; cooking about 10% faster than a furnace.
The second, and probably more important feature of a witches oven, is that it is able to capture the by-products produced in the cooking process. Activating the oven to show the interface screen, you will see an additional slot to the right of the fuel slot. Clay jars must be placed in this slot. If there are clay jars present when something is cooked, there is a chance a by-product will be captured in one of the jars. These by-products are important ingredients in other recipes. If there are no clay jars in the oven when something is cooked, no by-products will be produced.
The oven is crafted using Iron Ingots and Iron Bars.
The by-products that can be produced by an oven depend on what is being cooked, the most important ones will come from cooking tree saplings, which are a very important component in witchcraft.
Oven by-productsUpgrading an OvenAn oven can be upgraded by placing either a Fume Funnel or a Filtered Fume Funnel to the left and right of it. Each Fume Funnel will increase the cooking speed by and additional 10% (over a furnace) and increase the chance of a by-product being produced by and additional 25% for a Fume Funnel or 30% for a Filtered Fume Funnel. An Oven can use at most two upgrades and they must have the same facing as the oven. A fully upgraded oven will therefore cook at 130% speed (compared to a furnace) and have a chance of a by-product of 90%.
Recipe prior to verion 0.21 The oven is crafted using Iron Ingots, a Bucket and Iron Bars. | 
