护国寺小吃 is one of the well known Beijing food place that has a few outlets across the city. If this is your first time in Beijing, I would recommend you to visit their original place at 护国寺街.
This time I went for something interesting, the 面茶 is made of grain crop that turned into thick porridge. Topped with peanut sauce, making it taste savoury sweet.
Acquired taste I would say if you never try it before, but comforting food to enjoy in the morning to begin your day here. Do grab some of their fried doughs as well.