Put food in boiling water for a while until it can be eat.也就是把食材放在煮开的水中煮一会儿直到它熟。

这个是什么我也不知道，是不是来自台湾的？

This expression is only used for recipe instructions. 汆水 is a very professional words even though as a Chinese native speaker might not know, which means immersing the food in the boiling water. 断生 I think it means making the food cooked. 氽水斷生後 is a very uncommon expression in Chinese, which is a kind of jargon.