This saucy noodle dish is inspired by the slightly sweet, mellow curries that are hugely popular in Japan for lunch and dinner, or so we hear. A simple roux-based curry sauce is prepared first, then stirred into udon, bits of sautéed seitan, and crips veggies. Experiment – change the vegetables, use tofu in place of seitan, try different brands of curry powder – the variations are endless.