Tzatziki Cucumber Dip 

Ingredients:
3 tbsp. olive oil
1 tbsp. vinegar
2 cloves garlic, minced finely
1/2 tsp. salt
1/4 tsp. white pepper
1 cup greek yogurt, strained
1 cup sour cream
2 cucumbers, peeled, seeded and diced
1 tsp. chopped fresh dill

Directions:
1. Combine olive oil, vinegar, garlic, salt, and pepper in a bowl. Mix until well combined. 
2. Using a whisk, blend the yogurt with the sour cream. Add the olive oil mixture to the yogurt mixture and mix well. 
3. Add the cucumber and chopped fresh dill. Chill for at least two hours before serving.

*Source: http://greekfood.about.com/od/dipsspreadspures1/r/Tzatziki.htm