What is beef tallow, the animal fat allegedly used in Tirupati ladoos?

A controversy has emerged over the alleged use of substandard ingredients and animal fat in Tirupati laddu preparation. The Telugu Desam Party claims a Gujarat lab confirmed the presence of beef tallow, lard, and fish oil in ghee samples. The Tirumala Tirupati Devasthanams has blacklisted the supplier and switched to a new ghee provider.