McDonald's Special Sauce
1/4 cup salad dressing (like Miracle Whip®)
1/4 cup mayonnaise
3 tbs French salad dressing
1/2 tbs sweet pickle relish
1 1/2 tbs dill pickle relish
1 tsp sugar
1 tsp dried, minced onion
1 tsp white vinegar
1 tsp ketchup
1/8 tsp salt

Mix all ingredients, and stir well in a small container.
Microwave on high for 25 seconds, and stir well again.
Cover, and refrigerate at least 1 hour before serving.