New England Clam Chowder

Combine first 5 ingredients in a large saucepan over medium-high heat; bring to a boil. Cover and simmer 10 minutes or until potato is tender.

Add clams, and return mixture to a boil, stirring occasionally. Remove from heat, and let stand 20 minutes.

Stir in cream and butter. Cook over low heat, stirring constantly, until thoroughly heated.