Add all ingredients except oil to a blender. Pulse until everything is slightly broken down.
With the blender running on medium-low speed, slowly drizzle the oil in as it blends until incorporated. If desired, season to taste with sea salt and black pepper.
Notes
For the best flavor, use fresh herbs. If necessary, substitute with 1/4 teaspoon each of dried parsley and chives.
Incorporate the oil slowly, so that it forms a creamy dressing. If you add it to the blender all at once, the oil won't combine with the lemon juice.
To store: Transfer to an airtight container and refrigerate for up to 5 days.