You can get green coffee beans at a local coffee shop that roasts their own. Just ask, most will sell to you in small quantities.
Use a popcorn popper to keep the beans moving constantly to ensure an even roast.
You will need to experiment a bit to get the darkness and flavor that you prefer.
When the beans are roasting, they will pop a bit. The chaff left over when you are done roasting should be blown off outside when you are cooling the beans. The beans should be cooled rapidly to stop the internal roasting.
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