Green Goddess Potato Salad

Name: Green Goddess Potato Salad
Ingredients: For the Green Goddess Dressing; 1 cup fresh parsley (stems and leaves okay); 1 cup spinach (stems and leaves okay); 1/2 to 1 cups fresh assorted herbs, depending on your tastes (see note above); 2 cloves of garlic, roughly chopped; 2 tablespoons fresh lemon juice; 2 tablespoons white wine vinegar; Zest from one lemon; 1 teaspoon Worcestershire Sauce; 1/2 cup neutral oil (like grapeseed or sunflower oil); 1/2 cup scant, mayonnaise (preferably Duke's); Salt and pepper to taste; For the Rest; 3 pounds sturdy white or yellow potatoes (like Yukon Golds or Maine Potatoes); 2-3 radishes, finely diced (about 1/2 cup); 1/2 cup green onions, chopped; 1 cup shelled pistachios, chopped and divided (3/4 cup for salad and 1/4 cup for garnish); Salt to taste; Fresh herbs for garnish