Potato Salad

3 cups cooked potatoes, diced
4 hard-boiled eggs, chopped
1 small onion, chopped
1 small pimento, chopped
1 cup low-fat cottage cheese
1/3 cup buttermilk
Grated Cheddar cheese

Mix potatoes, eggs, onion and pimento thoroughly and salt to taste. Mix cottage cheese and buttermilk in the blender on medium speed until smooth and creamy. Mix with the potato mixture. Cover with cheese, if desired.