Cook until the sugar starts to caramelize.

煮到糖开始熬成焦糖。

《柯林斯英汉双解大词典》

Now turn the heat to medium high so the sugar foams up and begin to caramelize .

调至中高火煮糖至泛起泡沫变成焦糖色。

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Now turn the heat to medium high so the sugar foams up and begin to caramelize .

调至中高火煮糖至泛起泡沫变成焦糖色。

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