Step 1: Combine Dairy Base: In a medium-sized bowl, whisk together the buttermilk, mayonnaise, and sour cream until the mixture is smooth and well combined. Ensure no lumps remain for a creamy texture.
Step 2: Incorporate Dry Herbs and Spices: Add the dried parsley, dill weed, garlic powder, onion powder, salt, and black pepper to the dairy base. Stir well to evenly distribute the herbs and spices throughout the mixture.
Step 3: Add Vinegar: Stir in the white vinegar. It brightens the flavor profile of the dressing.
Step 4: Adjust Seasoning: Taste the dressing and adjust the seasoning as needed. Add more salt or pepper to suit your preference.
Step 5: Chill and Thicken: Cover the bowl with plastic wrap and refrigerate for at least 30 minutes, or preferably 1-2 hours. This allows the flavors to meld together and the dressing to thicken slightly.
Step 6: Serve: Before serving, stir the dressing to ensure it's well mixed. Serve chilled over salads, vegetables, or as a dipping sauce.
Optional tips: For a richer flavor, use full-fat mayonnaise and sour cream. If fresh herbs are available, substitute 1 tablespoon of fresh parsley and 1 teaspoon of fresh dill, finely chopped, for the dried herbs.