她在平底锅里慢慢加热糖浆，直到它开始焦糖化变成金棕色。

She heated the syrup slowly in the pan until it started ___caramelizing into a golden brown color.

慢慢加热糖浆直到它开始焦糖化，变成金黄色。

Heat the syrup slowly until it starts ___caramelizing and turns golden brown.