Green herb sauce for dipping asparagus

Ingredients

• 1/2 bunch Italian parsley, cleaned and dried
• 1/2 bunch fresh dill, cleaned and dried
• 1/2 bunch fresh watercress, cleaned and dried
• 1/2 cup drained cooked fresh spinach, all liquid squeezed out
• 2 scallions (green onions) tender greens included, sliced thin
• 2 cups mayonnaise
• 1 cup sour cream
• to taste salt and ground black pepper
• recipeIngredient ends