Other comparable products are seitan, wheatmeat, and tempeh. The recipe has a meatless adaptation using seitan (seitan piccata). Vegan onion gravy also exists, which may use seitan cooking broth in its preparation. Seitan can also be formed into vegetarian bacon. In 1962, wheat gluten was sold as seitan in Japan by Marushima Shoyu K.K. Seitan produced from wheat flour is a longer process. Vedge has their seitan custom-formulated by a local artisan producer. The meaning of the word "seitan" has undergone a gradual evolution.