I’m not a coffee drinker myself so I can’t speak from first hand experience, but I have seen them roasting coffee at Buna and they bring it over to the table for people to smell before serving.
I love, love, love the tiramisu at Buna and it seems like that would go well with coffee. I had assumed they got the tiramisu from an outside vendor, but when I asked, the owner told me his wife makes it. He explained that there is a big pastry tradition in Addis Ababa because of colonization. They also sometimes have teff cookies at Buna that they get from an Ethiopian-owned bakery in Las Vegas. I love them with tea and I assume they would go well with coffee as well.
P.S. I just had Ethiopian food in Washington D.C. D.C. is where Ethiopians first emigrated and there are many, many Ethiopian restaurants in D.C. Maybe I chose wrong, but the one Ethiopian restaurant I tried was not nearly as good as what I have had on Fairfax. Among other things, the sambosas were not freshly made and had clearly been reheated. I would rather wait forever for my sambosa at Buna and have it come piping hot from the fryer.