Ah,
the richness!
While fats themselves dont have a taste, anyone
who savors a good cheesecake knows how important fat is to making food enjoyable.
Fat won't actually reduce the amount of salt in your soup, but it will coat
the tongues of your guests and block some salt from reaching their taste buds.
There's another approach that might also be effective. Try the other answers
to see what it is, or move on to the next question.