Heat sesame oil over medium heat and stir fry the lotus root. Once almost finished cooking (about 75% and starting to look more translucent), add the sake, mirin and sugar. Cook for about 2 minutes or until liquid is mostly evaporated. Add the soy sauce and fry for 1 minute, or until most of the sauce is soaked up. Lastly toss in the chili pepper and sesame seeds. Remove from burner, serve and enjoy!