Japan — Soup & Stew Matrix: okayu/zosui rice porridges

Build a winter Soup/Stew Matrix for Japan featuring okayu/zosui rice porridges. Return a matrix as CSV text: dish, region/city, broth base, richness (1–5), spice (0–5), ideal weather, side/pickle pairing, reheats well (Y/N), allergen flags.