The base classes.

Base.scala

class Dirt

class GardenItem extends Dirt {
  val flavor = "seedy"
}

class Cucumber extends GardenItem {
  override val flavor = "bland"
}

class Watermelon extends GardenItem {
  override val flavor = "sweet"
}

class Cocktail extends Cucumber {
  override val flavor = "refreshing"
}

class FruitSalad extends Watermelon {
  override val flavor = "fruity"
}