In a bowl, combine the mayonnaise, Greek yogurt, Worcestershire sauce, Dijon mustard, garlic, salt, black pepper, dill, and parsley. Whisk until smooth and store in the refrigerator until serving. This can be made two days in advance.
¼ cup mayonnaise, ¼ cup plain Greek yogurt, 2 tsp Worcestershire sauce, 1 tbsp Dijon mustard, 2 cloves garlic, ½ tsp kosher salt, ½ tsp freshly ground black pepper, 1 tbsp minced fresh dill, 1 tbsp minced fresh parsley