Combine the extra virgin olive oil, wine vinegar, salt, and pepper in a blender.
Blend on high for about 30 seconds, or until a creamy, stable emulsion has formed.
Carefully taste the dressing.
Add more vinegar, one teaspoon at a time, until the acid balance is perfect for your palate.
If using, add the shallot to the blender. Pulse the machine on and off a few times just until the shallot is finely minced within the dressing.
Taste one last time and adjust seasoning if needed.
Serve immediately over your favorite greens or store for later.
Don't be afraid to experiment! This basic recipe is a launchpad. Try swapping the wine vinegar for fresh lemon juice, balsamic, or sherry vinegar.
Add fresh herbs, a touch of honey, or minced ginger to create your own signature dressing.