brew
v.v. to make a drink like tea or coffee by letting it sit in hot water. You can also use it to describe a storm or a problem that is starting to develop.
v. to prepare a beverage by steeping, boiling, or fermentation; metaphorically, to begin to develop or gather force.
I will brew a fresh pot of coffee for our guests.
You should let the tea brew for at least three minutes to get the best flavor.
While the baristas worked to brew the morning orders, a political storm was beginning to brew in the city council over new zoning laws.
The verb is both transitive (brewing tea) and intransitive (trouble is brewing).
The tea is brewing since ten minutes.The tea has been brewing for ten minutes.When describing an action that started in the past and continues now, use the present perfect continuous, not the present continuous.