1.   Cover the pan and let it simmer for fifteen minutes.

2.   Simmer for one hour.

3.   The row has been simmering for some time.

4.   ...bitter divisions that have simmered for more than half a century.

5.   The dispute simmered for years before any progress was made.

6.   The sauce should be simmered for a few minutes to concentrate its flavors.

7.   Anti-black violence had been simmering for months, fired by an economic crisis.

8.   As the Iron Curtain collapsed, however, so did many of the checks on tribal or sectarian hatred that simmered for decades.

9.   At the law school here, the Frederic G. Levin College of Law, people on both sides of the issue say tensions have simmered for years.

10.   A vivid yellow tomato soup, simmered for just a few minutes, then pureed and chilled, is a perfect example.