1. In a 2 to 3-quart pan over high heat, boil vinegar, vermouth, shallots, and tarragon until reduced to ¼ cup, 5 to 8 minutes. Let stand at room temperature up to 2 hours.
2. Just before serving, set pan over high heat, add butter, and stir constantly until it’s melted and bubbling, 2 to 3 minutes. Serve warm.

Yield: About 1 cup

PREP AND COOK TIME: About 10 minutes

NOTES: Serve this herby butter sauce with a mild fish like sole.

Source: Recipe developed by Sunset Magazine Test Kitchens.

www.sunsetmagazine.com