What's Dotha Mustard Ball Beam?

In 1390, there's this book written by a royal cook, King Richard the Seconds Royal Cook. The Form of Carry is spelled F-O-R-M-E and Currie's spelled C-U-R-Y. And this guy, this cook is all about mustard balls. This reminds me of stoner food. Well, yes, and also definitely going to use that as an expletive stand in. Holy mustard balls.