House Vinaigrette

Directions

1. 1
   Combine the mustard and vinegar in a blender and blend at medium speed for about 15 seconds. With the machine running, slowly drizzle in 1/2 cup of the oil. Don't be tempted to add all the oil to the blender or the vinaigrette will become too thick. It should be very creamy.
2. 2
   Transfer the vinaigrette to a small bowl and, whisking constantly, slowly stream in the remaining 1 cup oil. (The dressing can be refrigerated for up to 2 weeks. Should the vinaigrette separate, use a blender or immersion blender to re-emulsify it.)