Design Pattern: Template Method and Chipotle Raw

diet_order_tmp.rb

class DietOrder
  def vessel
    raise 'What is your choice?'
  end
  
  def meat
    raise 'What is your choice?'
  end
  
  def toppings
    Tomato
  end
  
  def extras
    nil
  end
  
  def order
    meal = vessel
    meal << meat
    meal << toppings
    meal << extras
    meal
  end
end

class DietOrderSihui < DietOrder
  def vessel
    Bowl
  end
  
  def meat
    Steak
  end
end

class DietOrderAmber < DietOrder
  def vessel
    Burrito
  end
  
  def meat
    Chicken
  end
end