Lentil Stew with Italian Sausage and Kale

Name: Lentil Stew with Italian Sausage and Kale
Ingredients: 1/2 pound Italian sausage (casing removed and crumbled); 1 tablespoon oil; 1 onion (diced); 1 carrot (diced); 2 stalks celery (diced); 2 cloves garlic (chopped); chili pepper flakes to taste; 1 cup white wine (or chicken stock); 1 cup de puy lentils; 2 cups chicken stock; 1 bay leaf; 1/2 teaspoon oregano; 1 tablespoon balsamic vinegar; 1 parmigiano reggiano rind (optional); 1 bunch kale (cut into bit sized pieces) (or spinach or swiss chard, etc.); salt and pepper to taste; 1/4 cup parsley (chopped)