I have tried many different ways to coarsely grind whole spices. One day, I had to coarsely grind pepper to coat a steak. I was feeling lazy so I put the whole peppercorns in a ziplock bag and crushed them with a hammer. It worked! I have also used this method for crushing cardamom pods. I like this method because it is fun (you get to use a hammer), easy, and not messy. I highly recommend it!