How to Make It
Soak breadcrumbs in sherry vinegar until very soft.
Process parsley and 1/2 cup oil in a blender or food processor until smooth. Add breadcrumb mixture, basil, and next 6 ingredients; pulse until pureed. Add remaining 1/2 cup oil slowly, pulsing until well blended. Season to taste with salt and pepper. Adjust consistency with additional oil, if necessary.
Primo, Rockland, Maine