Salt & pepper
Add all ingredients, except the buttermilk, to a medium-sized bowl and whisk to combine.
Slowly add in buttermilk until the dressing reaches your desired consistency.
Serve immediately or refrigerate for a few hours for the most flavor.
If Vegan substitute for vegan mayo, dairy-free sour cream and plant or nut-based milk. Use fresh herbs for the most flavor. Avoid adding all of the buttermilk in at once. Add a little at a time for best results.