¼ cup butter 1 cup brown sugar 1 cup sugar ¾ cup sour cream 1 teaspoon vanilla ½ cup black walnuts

Melt butter in heavy saucepan. Add brown sugar and heat to boiling. Add sugar and sour cream. Cook over low heat, stirring constantly, until sugars dissolve. Cook to 236º, soft ball. Cool to room temperature. Add vanilla and nuts. Beat.
Nice and creamy. The tang of sour cream cuts the cloying sweetness, and I love black walnuts