Black Tomatoes. Kumato Tomato - 25 Seeds - Slicing Tomato - Spanish Heirloom by wbut2023 It delivers a complex flavor that is succulent, sweet, and slightly tart. And no, the tone is not due to genetically modified whatsoever. Looking at the black tomatoes , also known as kumatos tomatoes , do not be intimidated by its color and strange appearance, these black tomatoes could have great potential to prevent muc has diseases. Fruit is not transgenic and the resulting product of genetic engineering. This is a consequence of selection techniques, research and mixing of different varieties using conventional and natural methods . The black tomato born in the Mediterranean in the Spanish city of Almeria in the 70s.