Creamy Potato Soup with Bacon Vinaigrette

Name: Creamy Potato Soup with Bacon Vinaigrette
Ingredients: For the Soup; 1 tablespoon butter; 1 large onion diced; 1 large carrot diced; 1 rib celery diced; 3 cloves garlic diced; 1 sprig rosemary chopped; 1 teaspoon salt; 6 medium Russet potatoes (about 2 lbs.) peeled and diced into 1 cubes; 7 cups chicken stock or water; 1 cup low fat sour cream; salt and pepper to taste; For vinaigrette; 4 pieces thick cut bacon; 3 green onions finely sliced; 3 tablespoons white wine vinegar; 2 tablespoons olive oil; pinch salt