People in the South have their own personalized versions of this sauce. Here is mine.
You will need-
1/4 cup extra virgin olive oil
1 cup mayonnaise
2 garlic gloves
5 larger green onions
2 tablespoons chili powder
1 teaspoon Worcestershire sauce
1/4 tsp black pepper
1/8 cup stone ground mustard
1/4 cup hot sweet mustard
2 tsp balsamic vinegar
several dashes hot sauce to taste
Mince the green onions and two cloves of garlic. In a jar add all the ingredients and shake well.
Refrigerate overnight to let the flavors meld. I always keep some on hand as it brings everyday sandwiches up a notch.