The Mutator is a non-multiblock block in the mod Hearth Well that can be used to mutate plants, meat, and water buckets into milk buckets.
In order to use the mutator, you need the Mutator itself, mutation paste, and a lever. Put the mutation paste in, a lever on any side, and the thing you want to mutate. Keep flipping the lever to get what you want. Mutating is changing the type of item itself (eg: Oak Sapling-> Jungle Sapling)