Step 3. Start roasting
Pro tip: Listen for the "first crack" of the beans
The other great benefit to roasting your own beans (apart from the freshness, duh) is that you have full control over the boldness of the flavor and level of caffeine.
Once you've dumped the raw beans in your heating element, crank the heat and stir. As you watch, they'll slowly begin to change color from green to yellow, and eventually to light brown, which is when you should perk up your ears to hear them crack, a sound vaguely similar to popcorn popping. This is what the pros call the "first crack," and it signals when you begin to see chaff (a.k.a. the husk of the raw bean) appear in the hopper. If you're using the popcorn popper, the chaff should rise up and out the spout on its own, but if you're using a different heating method you can simply blow it off the top.