This is a nice easy vinaigrette to make when you don't want the bottled stuff with all its chemicals and such.
1-1/2 tablespoons red wine vinegar
1 tablespoon chopped shallots
1/4 teaspoon salt
1 tablespoon Dijon mustard
1/8 teaspoon pepper
3 tablespoons extra-virgin olive oil
Combine vinegar, shallots, salt, Dijon mustard and pepper. Gradually add olive oil, stirring until incorporated.