The Secret Ingredient (Dijon Mustard): Simple Vinaigrette Recipe

In the bottom of a large salad serving bowl, whisk together the mustard, vinegar, salt, and pepper with a small whisk until the mixture is completely homogenous. If you don't have a whisk, use a fork. Add the olive oil, and whisk again until completely homogenous and emulsified. Tumble enough salad for four people on top, and toss gently to dress.