The Convini Oden 

It's just awesome item when you are cold in the winter and you just want to something to take out to eat.  You can basically find from any convenient Store in Japan (Seven Eleven, Family Mart, Sunkus or Lawson). You can pick the ones you like and it usually cost about 100 yen a piece plus the broth. My favorite has always Daikon (radish), Tamago (egg), and Hanpen (big white thing in the pic, which is steamed fish grind.  If you don't have any dinner plan, try Oden to warm you up.