Combine vinegar, garlic, mustard, salt, and pepper in small bowl. Whisk until well combined. Continue to whisk while adding oil in steady stream. Add more salt & pepper, if desired.
Serve immediately or store in the refrigerator in a jar with a screw top lid. Before serving, shake jar to mix well.
Try this with Spinach Salad with Dried Cranberries and Walnuts or Gold Beet and Goat Cheese Salad.