I feel like if you're visiting Beijing as a tourist, it's mainly to see ancient architecture, museums, Tiananmen Square, and such, since it's the political capital. If you're coming for the food, well, you might be a bit disappointed as options can seem limited and we might not be the best hosts in that regard. (Though personally, I think Peking duck and copper pot hot pot are incredibly delicious, and Zha Jiang Mian is my absolute favorite!)