Shit straight out of Secret Eaters. The idea is that they don't care for the tastes you or I would appreciate, so instead of just spiking the flavor a little (I like mayonnaise with tomatoes and turkey slices) they ensure that you taste nothing but oil. I'm reminded of /u/doctor_eat_less mentioning that some deathfats crave the richest foods possible.  It's odd to me because for a human to eat that hearty, you'd have to be ravenously hungry.