Once the milk sauce can cover the spoon, stir in the cold caramel.
牛奶酱覆盖勺子时，就搅进冷焦糖。
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More civilised nations prefer cultured butters made from soured milk, which have a delicious, rich flavour, often with elements of fresh grass or caramel.
McDonald's allows parents to swap milk or juice for soda in its Happy Meals. It also offers sliced apples with caramel sauce and chicken nuggets as alternatives to French fries and hamburgers.