- 3 tablespoons extra-virgin olive oil
- 1 tablespoon whole-grain mustard
- 1 tablespoon balsamic vinegar
- salt and ground black pepper to taste
- Combine olive oil, mustard, vinegar, salt, and pepper in a Mason jar or container with a tight-fitting lid; cover tightly with the lid and shake vigorously until thickened, about 2 minutes. Taste dressing and adjust flavor with salt and pepper.