This is awesome on fish.

1 cucumber, peeled, halved and seeded
1/2 teaspoon kosher salt
4 tablespoons fresh lemon juice
1/2 cup low-fat sour cream
1 tablespoon dill
pinch cayenne pepper
white pepper to taste

1. Purée the cucumber with the salt in a blender or food processor.
2. Place the cucumber purée in a bowl and stir in the remaining
ingredients.