This has ben adapted from the 3 fat chicks website. 

Ingredients

Enough spiral pasta for 8 people, cooked, drained and cooled.
2/3 cup nonfat yogurt
1/3 cup peeled, seeded and chopped cucumber
2 Tablespoons sliced gren onion
2 Tablespoons low-fat 1 percent milk
1 Tablespoon fresh lime juice
1 Tablespoon WW mayonaise
3/4 teaspoon salt
1/4 teaspoon minced garlic
Pinch of sugar

Method

Mix the last 9 ingredients and toss through the pasta. Serve