Poutine-Style Twice-Baked Potatoes

Name: Poutine-Style Twice-Baked Potatoes
Cook time: 2 h 30 min
Total time: 2 h 30 min
Cuisine: American
Ingredients: 2 tablespoons unsalted butter; 2 tablespoons all-purpose flour; 2 cups chicken stock or low-sodium broth; 1 tablespoon veal demiglace (optional); 0.5 teaspoon sage (finely chopped); 0.5 teaspoon thyme (finely chopped); 1 tablespoon lemon juice (freshly squeezed); 1 tablespoon heavy cream; Kosher salt; Freshly ground pepper; 6 baked potatoes (about 1/2 pound each); 6 tablespoons unsalted butter (cubed and chilled); 1 cup milk (warmed); 0.5 cup sour cream; 3 ounces freshly grated Parmigiano-Reggiano cheese (1 cup); 1 tablespoon Dijon mustard; 1 pinch of cayenne pepper; 0.33 cup chives (chopped); Vegetable oil (for frying); 6 ounces thick-sliced bacon (cut crosswise 1/2 inch thick); 1 cup shredded mozzarella cheese; Sour cream, thinly sliced scallions, parsley leaves and celery leaves (for garnish)