Use this dressing when making potato salad for a more sophisticated touch.  Add snap peas or asparagus for real elegance.

Ingredients:

• 2 tsp tarragon vinegar
• 3/4 tsp Dijon mustard
• coarse salt
• 1/4 c extra-virgin olive oil
• 1/4 c sour cream
• 2 Tab finely chopped fresh tarragon
• freshly ground pepper

Directions:

1. Stir together tarragon vinegar and Dijon mustard.
2. Season with coarse salt.
3. Pour in olive oil in a slow, steady stream, whisking until emulsified.
4. Stir in sour cream and tarragon.
5. Season with freshly ground pepper.

Serves:  makes 1/2 cup
Source: marthastewart.com.