Bring to a boil, lower heat and simmer until tender, about 20 minutes.

Bring to the boil, then lower heat, cover and simmer for one hour.

Bring to a simmer and then lower heat so liquids don't reduce.

Bring to a boil, lower heat, and simmer until they are just tender, 20 to 25 minutes.

Bring to a boil, lower heat and simmer 5 minutes.

Bring to a boil, lower heat and simmer for 10 minutes.

Bring to a boil, lower heat and simmer for one hour.

Bring to a boil, then lower heat and simmer until tender, about an hour.

Cover pot, bring water to a boil and then lower heat to a simmer.

Bring to a boil over low heat, skimming the fat often.