Turkey Breakfast Hash with Poached Egg

Name: Turkey Breakfast Hash with Poached Egg
Ingredients: 4 ounces bacon, diced; 1 small onion, diced; 1 stalk celery, diced; ½ pound cooked turkey, roughly chopped (preferably dark meat); 1 cup roasted Brussels sprouts, quartered; ½ cup roasted chestnuts, roughly chopped; 1 teaspoon cayenne pepper; 2 tablespoons Wild Turkey bourbon; 1 cup gravy, divided; 1 tablespoon chopped sage; 1 tablespoon chopped parsley; ½ teaspoon chopped rosemary; ½ pound baked potatoes, diced; 4 eggs; 1 tablespoon white vinegar; 2 teaspoons chopped chive; Salt and pepper; ¼ bunch red watercress, picked and washed