public NormalBurgerViewModelBuilder(Burger burgerWithMeat)
 {
     this.HamburgerViewModel = new GetABurgerViewModel();
     this.burgerWithMeat     = burgerWithMeat;
 }
 public VegetarianBurgerViewModelBuilder(Burger vegetarianBurger)
 {
     this.HamburgerViewModel = new GetABurgerViewModel();
     this.vegetarianBurger   = vegetarianBurger;
 }