Ketchup in your vinaigrette? Yes, ketchup in your vinaigrette Youll thank us later. Think of it as french dressings cute younger sister. Here, its paired with a chopped tomato, cucumber, and red onion combination, but its surprisingly versatile. The dressing would work well as a quick steak marinade or as a basting sauce for shrimp. Turn this salad into a filling dinner by adding shredded chicken and avocado, or chickpeas and hard-cooked eggs.