That’s the gravy on the cake

The yuck factor is high on this one.  This is a congruent conflation of “icing on the cake” and “the rest is just gravy”, both meaning an extra enhancement.  Perhaps this one describes a little too much enhancement.   This is very similar to an earlier posting, “that would just be gravy on the icing”, submitted 9 years ago. https://malaphors.com/2014/10/06/that-would-just-be-gravy-on-the-icing/

A tip of the hat to “gsdoghouse” for sending this one in and his/her friend Candy for uttering it.