Saute the onions
in butter until soft. Add in the remaining ingredients and bring to a simmer
Allow to simmer for approximately 15 minutes.
Puree with a stick blender
until smooth, then check for seasonings. Cool to room temperature and refrigerate.
Yield: about 2 to 3 cups
Prep Time: 5 minutes
Cook Time: 25 minutes
Ease of preparation: easy