Beef eating is not allowed in Hinduism, In Hinduism always preach to follow vegeterian, Those who eat beef or do leather works(like making sandals) are called as chandals and they r out casted and called untouchables, In aghora practism there are no restictions and they live outside villages mainly in or near graveyards.Also those people are known for black magic.In one of Vedas(rig veda) they mentioned all types of Practism.