Despite the name, green coffee beans aren’t actually beans, but raw seeds from the coffee cherry. All of the coffee’s flavor potential is held within this green seed and is unleashed during the roast. This is when the beans change to their familiar brown color.
While green beans give you the opportunity to tweak the roast and flavor to your liking, you will not achieve a delicious roast unless these beans are carefully selected. The type and quality of the beans can easily determine whether it will be a tasty or a terrible cup.