I have seen coffee prepared as in Qatar: It was mixed with cardamon, and had a light brown colour. The taste was excellent. I was told that the coffee beans were roasted only very little. Which kind of coffee beans are typically used for this coffee in Qatar, and can one get them in Europe.
Arabic coffee can refer to black coffee, similar to Turkish coffee or the lighter, greenish-brown coffee drunk in Saudi and the UAE. Both are commonly flavoured with cardamon.
There isn't any specific type of coffee bean that needs to be used, as long as it's only been lightly roasted.
This beverage made from the skins and pulp of coffee cherries; that is, coffee cherry tea is made from the parts of the coffee fruit that surround the coffee beans. Conventional coffee is made from the roasted "coffee beans" (seeds of the coffee fruit); coffee cherry tea is made from the fruit that surrounds the beans.
Cascara tastes vaguely of coffee, is somewhat sweet, and (to me) delicious. Coffee cherry skins and pulp (or "husks") are difficult to find outside the coffee belt. As I mentioned as an aside in this SA question, I found cascara for sale from Verve.