This mao cai restaurant was named appropriately - Hong You Fang, or red oil house.
The baskets of ingredients simmered away in the spicy soup:
My vegetable version was pretty spicy. I got a bottle of peanut milk (豆奶) on ths side to tame the heat.
Address: 二环路东三段三号新居, on a small street north of the second ring across from Cheng Hua Ito Yokado