scientists suggest that prehistoric human cousins used herbs like yarrow and camomile to improve the taste of their food around 50,000 years ago .
chimps in uganda also eat plants with their meat in a way that is thought to flavour their food so researchers believe neanderthals also did the same .
it build recent discoveries that suggest they also ate barley , olives and nuts .
the findings transform the view of neanderthals as unsophisticated brutes .