Julia Child's Vinaigrette Recipe

Name: Julia Child's Vinaigrette Recipe
Cuisine: European, Mediterranean, French
Ingredients: 1/2 tablespoon shallot or scallion, finely minced; 1/2 tablespoon Dijon mustard; 1/4 tablespoon salt (or to taste); Juice of 1 lemon; 1/2 tablespoon white or red wine vinegar; 1/3 to 1/2 cup good-quality olive oil; Freshly ground pepper (to taste)