Put the buttermilk, avocado, cilantro, dill, parsley, vinegar, scallions and garlic in a blender and blend until smooth. Transfer to a medium bowl and season with 1/2 teaspoon salt. Fold in the tomato. Cover with plastic wrap that sits directly on top of the dip and refrigerate for 30 minutes or up to 1 day before using. Serve with pita chips for dipping.
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