I've passed by Abyssinia many times. Once, humorously thinking that the name was a word play for "I'll be seeing ya." Nope. Abyssinia was actually what Ethiopia was once called in early history.
I've been to only a couple of Ethiopian restaurants in my life, once in Washington D.C. and another time in SF. I went to Abyssinia for lunch with 4 coworkers and we were seated on regular dining tables. For dinner though, they make the entire dining area available. So if you're into a much more interesting experience, opt for no table and sit on the stools surrounding a basket which holds the food that you and your party will be sharing. There will be no plates and don't even think about asking for utensils. Ethiopians eat this stuff with their hands. and everything just tastes better when you do the same. If you're grossed out by having other people's fingers in your food, this might not be your cup of tea.
Our server recommended we share 2 meat combinations and their veggie combination. However, the food came out around 40 minutes after we ordered. Not sure if this was the norm but it was exceedingly slow since we were there on our lunch break from work. The food came on a large platter of stewed dishes on top of Injera bread and more bread on the side. Injera, an Ethiopian food staple, is a spongy flat bread used to sop up the food. The dough is fermented (like sourdough) which gives it a mildly-sour flavor. There was an assortment of meats (chicken, beef and lamb) and stewed veggie dishes. Wish our server took the time to give us a quick rundown of the dishes. I knew we ordered lamb but sadly couldn't tell which meat was which. Maybe it was due to the strong flavor of the stews. Some dishes were spicier than others and good overall but not the best I've ever tried. I will be returning - curious about the experience at dinner time. "I'll be seeing ya." Again.