Ingredients: 80 g / ⅓ cup good quality mayonnaise 80 g / ⅓ cup full fat Greek yogurt (or sour cream) 2 tablespoons apple cider vinegar (or white wine vinegar) – (use 1 tablespoon if you prefer less tangy) Salt and pepper (to taste) ½ onion (grated on the coarse side of the grater) 400…