Here's the recipe for the "frosting" I made for my cake:
Vegetable Dip
1 Cup (8 -oz) plain yogurt
3 green onions, chopped
1/4 tsp salt
1/4 tsp dill weed
1/8 tsp garlic salt
Dash of pepper
In bowl or blender, combine all ingredients. Refrigerate several hours to blend flavors. Each tablespoon of dip contains about 10 calories.