1/3 cup champagne vinegar, or other mild-flavored vinegar such as rice-wine vinegar
1 cup extra-virgin olive oil
1/2 teaspoon coarse salt
1/4 teaspoon freshly ground pepper, plus more to taste
Step 1
In a small bowl, whisk mustard and vinegar together. Slowly add oil in a steady stream, whisking constantly until all the oil is added and dressing is creamy and emulsified. Add the salt and pepper; season with additional salt and pepper if desired.