Mentsuyu (noodle sauce) is a very versatile sauce that gives many dishes a great Japanese flavor.  This is perfect for dipping cold Soba or Somen noodles, tempura and more.　It is so easy to make and keeps well in the refrigerator (at least a couple weeks, stays for a month in my fridge), and comes in handy in a crunch time for dinner.   I actually make a lot of  it at once so that I don’t have to make it frequently (oh, lazy me).  You can cook meat and vegetables with this sauce as seasoning, like a quick teriyaki sauce, or just drizzle over steamed vegetables or tofu.