Creamy Potato and White Sweet Potato Soup (AIP, nightshade free, dairy free)

Name: Creamy Potato and White Sweet Potato Soup (AIP, nightshade free, dairy free)
Cuisine: Japanese, Asian
Ingredients: 12 oz. package nitrate free bacon, diced; 1 onion, chopped; 2 carrots, chopped; 3 stalks celery, chopped; 1 leek (see note on preparation below); 4 cloves garlic, minced; 2 bay leaves; 6 cups white sweet potatoes, peeled and cubed; 6 cups parsnips, peeled and cubed (or rutabaga or combination of both); 8 cups chicken bone broth; 5-7 cups cooked chicken, shredded; juice of one large lemon (maybe more); salt and pepper to taste; sliced green onions, optional