As you can see in the video I like to use my meat mallet because it makes fast work of crushing, and it's very satisfying to use. A rolling pin is also a great way to crush candy, and of course a hammer will work in a pinch. Just make sure you don't smack the candy so hard that you put holes in the plastic bag as that can happen easily if you're too aggressive (not that I'd know anything about that! LOL)