I have always just mixed mayo and salad dressing in with the cold potatoes, radishes and onions for potato salad.
I got to thinking that if I blended the ingredients it would make a smoother dressing and this was delicious!! I could see using it on a Caesar salad or coleslaw.
Adjust the items depending on how much you need.
1/2 cup olive oil mayo
1/4 cup sour cream
1/4 cup Italian salad dressing2 tablespoons fresh lemon juice
2 tablespoons Dijon mustard
2 cloves garlic, roughly chopped
Freshly ground black pepper, to taste