Green coffee beans are simply regular coffee beans that haven’t been roasted and remain completely raw.
Their extract is popular as a dietary supplement, but green coffee can also be purchased in whole-bean form and used to make a hot beverage, much like roasted coffee.
Bear in mind that a mug of this light green drink will not taste like the roasted coffee you’re used to, as it has a much milder flavor. It’s said to taste more like herbal tea than coffee.