Combine all of the ingredients in a small bowl or mason jar and whisk (or shake) until fully blended. Dressing may be prepared up to 2 days in advance and stored in the fridge.
TIP A: Use 1 tablespoon vinegar if your lemon yields a lot of juice or you prefer a more smooth-flavored dressing. Use 2 tablespoons vinegar if you like a tangier dressing.