This is the second time I have written about Hunan Gate, but I wanted to write a post about the authentic Dongbei dishes served here. While the lady who runs the restaurant is from Nanjing (maybe try the Nanjing cold duck dish), the chef is from Dongbei, so these dishes are what you should order.
Make sure you order from the Chinese menu and not the American-Chinese food menu. I would recommend ordering the pork belly with potato noodles (东北白菜猪肉炖粉条) as a main dish and then either the triple vegetable delight (Di San Xian, 地三鲜) or pickled cabbage with frozen tofu (Suan Cai Dun Dong Dou Fu, 酸菜炖冻豆腐). The pickled cabbage perfectly complements the fatty flavors of the pork belly, so I recommend those two dishes.
Below are pictures of the three dishes that i mentioned.
Washington D.C. Asian Food 