This is not a precise recipe. A lot depends on how thick your homemade buttermilk turns out. I get to label it as a frugal recipe because I grow the herbs needed for the recipe.
2 cups buttermilk
sour cream
3 cloves minced garlic
1/4 cup Italian flat leaf parsley
2 tablespoons freshly chopped chives
2 tablespoons freshly chopped basil
1 tsp sea salt
freshly ground pepper to taste
Mix all of the ingredients together except for the sour cream and then whisk in just enough sour cream to bring the dressing to the desired consistency.