A favorite among ghosts. Not recommended for the living.
A Rotten Eclair is an item in Mother 3. It can only be used to make trades with certain Osohe ghosts or sold for 1 DP. They can be given by a ghost to the right of the banquet room's table (by answering 'Yes' the first time and 'No' every other time), or dropped by a Zombie Man, Zombie Lady, or Stinky Ghost (10% chance, 10% chance, and 50% chance, respectively). It's also found in the garbage dump where the old clayman containing the Hummingbird Egg is located, but it's useless at that point in the game.