Coffee beans come from the coffee tree (actually it is a tropical evergreen shrub). It has the potential to grow to 100 feet, however it is kept much shorter for ease of harvest. The leaves look similar to the leaves of a laurel bush and the blossoms have a Jasmine like aroma. The average coffee tree produces an annual yield of 1 to 1 1/2 pounds of roasted coffee. It takes about 4,000 hand-picked green coffee beans to make a pound of coffee.

I had one in my backyard in Hawaii in one place and I tried to harvest the beans. Look like I wasn't going to be able to drink a cup of my own coffee huh? I was wondering how to dry them. I tried to put them in the oven.
Do you have any idea?

Once coffee is picked, it can be prepared either by a "dry" method, which produces what is called natural coffee, or by the "wet" method, which produces what is known as "washed coffee".

Dry Method: The berries are dried, either by the sun or in a mechanical dryer. The hard, shriveled husk is removed from the bean by machine, soaking and washing with hot water, or by using either a grindstone or mortar and pestle.

Wet Method: Most of the covering is removed from the bean before it is dried leaving the beans covered with a sticky substance.The beans are then fermented in large tanks by softening them in water, allowing natural enzymes to digest the sticky substance from the bean. The coffee is washed and dried either by the sun in open terraces or in large mechanical dryers.

Following preparation by either method, 2 thin layers still remain on the bean: the parchment or pergamino and the silver skin. A huller rubs these 2 layers off.

The last step in processing is cleaning. With most high-quality coffees, the beans are placed on conveyor belts or trays and examined by workers who remove defective beans, sticks, dirt, and other debris. The very best coffees may be cleaned twice.