Add about a liter of water, salt, and bring to a boil.

加入大约一升水和一点盐，然后煮沸。

We're using beef stock and bring to a boil.

我们用牛肉高汤煮沸。

Bring to a boil, reduce to a simmer, and keep it there for about an hour.

煮沸，转小火，保持约一个小时。