When conducting a Tu B’shevat Seder, it is wise to eat the various species of fruits in four groups; and discuss the four types of people these fruits represent.
One: Fruits with an exterior that is good to eat and a interior that is not, like Avocado, Peach or Plum.
Two: Fruits with an interior that is good to eat and an exterior that is not, like Pineapple, or Coconuts.
Three: Fruits with an exterior and an interior that are good to eat like Strawberries, Blueberries or Blackberries.
Four: Fruits with an exterior and an interior that are not good to eat for humans but good for other animals like Mistletoe berries, Snowberries or Citrons–Etrogim.