The butterfly cut has a reputation for being a little fiddly. One slip of the knife, and you've cut your meat in two. However ...

Don't cut all the way through the meat, just cut the top half so that the meat will spread in one big piece -- like butterfly wings. Carefully lift the meat from the shell while keeping it ...

“A beef roast is a good choice to butterfly because it creates ... Slice horizontally through the meat, parallel to the cutting board. Stop about one inch before cutting through the other ...