In a small bowl or jar, start by adding the Dijon mustard and red wine vinegar.
These ingredients will form the base of your vinaigrette.
Next, whisk these together until the mustard is fully dissolved in the vinegar, creating a smooth mixture.
This ensures the flavors meld nicely.
Slowly drizzle in the olive oil while continuously whisking.
This will help emulsify the dressing, giving it a uniform texture.
Season with a good pinch of salt and a few grinds of pepper to taste.
Remember, you can always adjust this later.
Finally, give the dressing a good shake if it's in a jar, or continue whisking if in a bowl, to combine everything well.
Your vinaigrette is now ready for use!