So I made some Michelle foster fondant and im getting little holds when i roll it out, whats going on?

I have recently started making MFF and find that I need to condition it before I roll it out. I work in small amounts of shortening into the fondant and that helps smooth it out to get rid of the holes. Work the fondant for a few minutes, kneading it really well.

Thanks. I add some tylose and it helped.