Meat transformed into a Burger using Ruby's subclassing, include and prepend

burger.rb

class Meat
  def burger
    puts "meat"
  end
end

class SauceAndMeat < Meat
  def burger
    puts "sauce"
    super # "meat"
  end
end

module Lettuce
  def burger
    puts "lettuce"
    super
  end
end

module UpperBun
  def burger
    puts "upper_bun"
    super
  end
end

module LowerBun
  def burger
    super # notice a difference in ordering?
    puts "lower_bun"
  end
end

SauceAndMeat.include(LowerBun)
SauceAndMeat.include(Lettuce)
SauceAndMeat.prepend(UpperBun)

SauceAndMeat.new.burger