A small amount of unsweetened chocolate gives the sauce rich, complex flavor with subtle cocoa notes. This sauce pairs well with beef, pork, and chicken.
Combine ketchup and next 9 ingredients (through pepper) in a medium saucepan; bring to a boil, stirring with a whisk. Reduce heat; simmer 8 minutes or until thick, stirring occasionally. Remove from heat; add chocolate, stirring until chocolate melts and mixture is smooth.
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