The coffee cherry is a really slow grower. It grows in trees that look like that of a mango. However, it is extremely slow growing and is never found near the poles, only near the equator. When you eat it it gives you an energy boost and you can also turn it into coffee which fills up your bar of energy.
It is a purple colour, and needs heat. If you think you've found one just meditate by it for a while until it's got it's fruit and it will be regognisable. -xZero