Add pork, pancetta, mushrooms, bay leaf, sugar and pepper. Cover and bake for 30 minutes. Add pearl onions, stir and continue to bake for an additional 30 minutes until pork is tender. Add potatoes, celery, carrots and dill. Bake for 20 minutes or until vegetable are just tender. Remove from oven and discard bay leaf. Stir in sour cream and peas and adjust seasoning with salt and pepper. Ladle a scant 1 1/2 cups into 6 ramekins or cocotte dishes.