Coffee is almost often brewed instantly before drinking. In most areas around the world, coffee may be purchased raw, or already pre-roasted, or both roasted and ground ahead of time. The coffee its self is often vacuum packed to hinder oxidation and prolong its shelf life before shipment.
Roasting coffee will in the end change the chemical and external properties of an immature coffee beans. When roasting, the raw coffee bean tends to enlarge to almost twofold its origin size, shifting in both color and compactness. As the beans draw in outside heat, its pigment shifts to yellowish color, then to an almost light cinnamon brownish hue, and finally to a opulent dark brown appearance. During roasting, oils will appear on the exterior of the bean. The roast will continue to darken at this point until it is removed from the heat source.
At Home coffee can be roasted with common kitchen equipment (such as a frying pan, grill, oven, popcorn popper) or by specialized appliances. such as a coffee roaster or other home instruments compatible to heat up and roast young coffee beans. Finally please, never reuse your old coffee grounds to make a new cup coffee. Once brewed, the desirable coffee flavors will have been extracted and only the bitterness of the bean is left Instead.