Kenchinjiru and Buddhist Root Vegetable Soup
Kencho-ji temple, Kamakura, Kanagawa; attributed to founding Chinese monk Rankei Doryu (1213–1278); spread through Rinzai Zen Buddhist temple network across Japan; now widely prepared in Japanese home cooking, particularly during winter, as a warming vegetarian soup without the strictly religious context
Kenchinjiru (けんちん汁) is Japan's most significant Buddhist vegetarian (shojin ryori) soup: a clear, dashi-based broth containing a combination of root vegetables (burdock root/gobo, carrot, daikon, lotus root), konnyaku, tofu, and sometimes fu (wheat gluten), sautéed first in sesame oil before simmering. The name derives from Kencho-ji, the founding Zen Buddhist temple in Kamakura (established 1253), where the soup was developed by Chinese monk Rankei Doryu. The soup's technique is specifically informed by Buddhist dietary restrictions: no meat, poultry, or fish (so the dashi is kombu-only or dried shiitake-kombu rather than katsuobushi), no root vegetables considered too stimulating (no garlic, no onion in strictly orthodox versions), and the cooking method of sautéing in sesame oil before simmering is unusually indulgent for shojin standards — the oil provides richness otherwise absent. The sauté step serves a specific function: it seals the vegetable surfaces to prevent disintegration during simmering, caramelises the cut surfaces slightly for flavour depth, and carries the sesame oil's aromatic compounds into the fat layer that floats on the finished soup's surface, providing richness. The finishing seasoning is light soy and salt only — no mirin or sugar, which would sweeten the austere character. Modern versions outside strict shojin contexts often include tofu simmered directly rather than sautéed, and some contemporary kenchinjiru adds a small amount of shio koji for depth within the Buddhist framework.