1 red onion medium-size finely chopped, or 3 fresh shallots, minced
2 tablespoons butter real
2 tablespoons vermouth
1/2 cup butter real
1/4 teaspoon salt
Sauté onion or shallots in 2 tablespoons butter until soft, about 5 minutes; add vermouth and cook until all liquid has evaporated. Cool thoroughly. Combine cooled mixture with 1/2 cup butter and salt. Whirl in blender or food processor until fluffy. Cover and refrigerate until ready to use.