How to remove "My Sites" > "Main Site" options on Admin bar

I have figured out how I want to customize my admin bar on my site using the Custom Admin plugin and a functions plugin a created for a few additional items, but there is one feature I can't seem to figure out how to get rid of. I want to remove the "My Sites" > "Go Teach Ministry" sub menu shown in the image below.

I would like to add it as a function to my custom plugin I have created. I can't seem to figure it out. Any idea?