Any idea on how to obtain this recipe yet?
From the description from the Inscription page, it appears is a discovery when a mage scribe uses the table.
That either means it’s a mage/scribe only recipe, or you can get it when you click on the mage table and poof you have it.
I hope it’s the latter for my Warlock scribe.
I hope they didn’t just make it for a Mage Scribe. This is my Scribe toon 
I had a mage sit with me for 20 or so minutes as I clicked on the tables she made. I got nothing.
I’ve been trying to figure out this myself with no luck. But my monk scribe isn’t maxed out and it appears to require 175 first.
I haven’t seen Glyph of Lavish Servings yet.
However, I did notice in last night’s raid that the default mage table graphic was back to the “drug lab” look of prior expansions.
I assume all the glyph does is let us use the new graphic that was introduced in 8.2.
You probably have to rub your belly and pat your head while you play the piano.