How do ketones taste?

Ketones are known for having a rather unpleasant taste. Dave Asprey likened the taste of ketone esters to raw liver, describing the need for mental preparation before consumption due to their repulsive flavor 1. Similarly, Ben Greenfield mentioned that ketone esters have a bitter, almost syrupy taste, though he personally doesn’t find it unbearable when diluted 2. Moreover, Tim Ferriss described ketone esters as having an extremely foul taste, almost to the level of inducing gagging and vomiting 3.