Lentil and Sausage Soup with Kale

Name: Lentil and Sausage Soup with Kale
Ingredients: 1 tablespoon olive oil, plus more for browning the sausages; 1 tablespoon bacon fat (or add another tablespoon of olive oil); 1 cup chopped carrots; 3/4 cup chopped celery; 1 medium onion, chopped; 3 cloves garlic, chopped; 1 pinch Salt; 1 1/2 cups french green lentils, rinsed; 28 ounces canned chopped tomatoes (I use tetra-pack); 2 sprigs thyme; 1 sprig rosemary; 4 chicken sausages (or substitute another kind of sausage); 1 1/2 cups chopped kale