文火慢炖（mijoter）是指用小火把水慢慢地烧开，这个过程中几乎看不到汤汁沸腾，只是从某一刻起会开始冒泡泡。
A very slow boil, when the liquid is hardly moving except for a bubble at one point, is called to simmer, mijoter.
煮沸 ，boutillir 当汤汁沸腾，滚动，开始冒泡泡的时候就算是煮沸了。
BOIL , boutillir Liquid is technically at the boil when it is seething, rolling, and sending up bubbles.
需要特别小心因为糖液会持续沸腾冒泡。
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