It's a little purple berry that's related to tomatoes:
They can be mistaken for deadly nightshade, and both plants are often called "black nightshade". The key difference is the color of the flowers. Wonderberry has white flowers, deadly nightshade has purple flowers.
>>Wonderberry has white flowers, deadly nightshade has purple flowers.<<
I am sort of reminded of the Gilligan’s Island reading of “How to tell a toadstool from a mushroom” by “the late Dr. Morton.”
Marianne: “The Late?”
Gilligan: “Late?”