Huitlacoche

Huitlacoche is also known as Corn smut, fungus, Mexican truffle, and Mexican caviar. Huitlacoche presents as a soft, spreadable, dark ingredient? 

Huitlacoche is a parasitic plant disease that grows on ears of corn, around the kernels, in puffy grey pouches resembling stones. Despite this, huitlacoche is a delicacy in some regional cuisines of Mexico.