Bacheofe Alsatian Meat and Vegetable Stew

Name: Bacheofe (Alsatian Meat and Vegetable Stew)
Ingredients: 1 lb. boneless beef chuck, trimmed and cut into 1½-in. pieces; 1 lb. boneless lamb shoulder, trimmed and cut into 1½-in. pieces; 1 lb. boneless pork shoulder, trimmed and cut into 1½-in. pieces; Kosher salt and freshly ground black pepper; 3 cups dry white wine; ¼ cup parsley leaves, finely chopped; 2 tsp. juniper berries; 5 garlic cloves, coarsely chopped; 2 bay leaves; 2 medium carrots, thinly sliced; 2 small leeks, trimmed and thinly sliced; 2 medium onions, thinly sliced; 2 thyme sprigs; ¼ cup duck or goose fat (optional); 3 lb. Yukon Gold potatoes, peeled and sliced; 1 lb. thick-cut bacon; 1 cup all-purpose flour, plus more for dusting