private List<DrinkIngredient> AddIngredients()
        {
            var _espresso = new DrinkIngredient { IngredientName = "Espresso", Unit = 3 };

            var ingredientList = new List<DrinkIngredient>();
            ingredientList.Add(_espresso);

            return ingredientList;
        }        
        private List<DrinkIngredient> AddIngredients()
        {
            var _espresso = new DrinkIngredient { IngredientName = "Espresso", Unit = 2 };
            var _steamedmilk = new DrinkIngredient { IngredientName = "Steamed Milk", Unit = 1 };

            var ingredientList = new List<DrinkIngredient>();
            ingredientList.Add(_espresso);
            ingredientList.Add(_steamedmilk);

            return ingredientList;
        }
        private List<DrinkIngredient> AddIngredients()
        {
            var _coffee = new DrinkIngredient { IngredientName = "Coffee", Unit = 3 };
            var _sugar = new DrinkIngredient { IngredientName = "Sugar", Unit = 1 };
            var _cream = new DrinkIngredient { IngredientName = "Cream", Unit = 1 };

            var ingredientList = new List<DrinkIngredient>();
            ingredientList.Add(_coffee);
            ingredientList.Add(_sugar);
            ingredientList.Add(_cream);

            return ingredientList;
        }
        private List<DrinkIngredient> AddIngredients()
        {
            var _espresso = new DrinkIngredient { IngredientName = "Espresso", Unit = 1 };
            var _cocoa = new DrinkIngredient { IngredientName = "Cocoa", Unit = 1 };
            var _steamedmilk = new DrinkIngredient { IngredientName = "Steamed Milk", Unit = 1 };
            var _whippedcream = new DrinkIngredient { IngredientName = "Whipped Cream", Unit = 1 };

            var ingredientList = new List<DrinkIngredient>();
            ingredientList.Add(_espresso);
            ingredientList.Add(_cocoa);
            ingredientList.Add(_steamedmilk);
            ingredientList.Add(_whippedcream);

            return ingredientList;
        }