Ingredients

1/2 cucumber, peeled and seeded 

2 tablespoons sherry vinegar 

2 tablespoons Dijon mustard 

1 tablespoon chopped fresh tarragon 

1/2 cup grapeseed oil 

Coarse salt and freshly ground pepper 

Preparation

Place cucumber, vinegar, mustard, and tarragon in a food processor, and process until smooth. With the machine running, drizzle in grapeseed oil; process until emulsified. Season with salt and pepper.