Question: What vegetable originating near the Beijing region of China is used in Haejang-guk?
Sentence (from "Haejang-guk"): One type of haejangguk, Seonjiguk, includes sliced congealed ox blood (similar to black pudding) and another type, Sundaeguk includes a kind of blood sausage made with intestine stuffed with pig's blood and other ingredients.
Relevant evidence: No