1. Mix olive oil, vinegar, salt and pepper until well combined. You can vary the taste by utilizing different ingredients like lemon juice, mint or garlic—throw everything in for a cool kick!
2. Whisk sour cream and yogurt together, and then add the oil mixture.
3. Throw in diced cucumber and chill for several hours.
4. Garnish sauce with a sprig of dill or serve on a sandwich, burger, or pita! You can use it instead of the rosemary aioli on this tasty Mediterranean flatbread: http://dofinousa.com/recipe/mediterranean-flatbread-with-creamy-havarti-slices-and-rosemary-aioli/