在制作焦糖布丁之前，你需要先将糖加热至焦糖化。

Before making crème brûlée, you need to ___caramelise the sugar first.

洋葱在低温下慢慢翻炒会变甜，因为它们会焦糖化。

Onions become sweeter when you cook them slowly at low heat, as they ___caramelise.