Classic Ham and Lentil Soup

Name: Classic Ham and Lentil Soup
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Cuisine: American
Ingredients: 1.5 cups dried lentils (approx. 16 oz., rinsed); 1.5 cups diced cooked ham; 1 cup sliced celery (about 2 stalks); 1/2 cup diced onion (about 1/2 large onion); 2 cloves garlic; 15 ounces canned diced tomatoes; 6 cups vegetable or chicken broth; 2 Tablespoons olive oil; 1 ham bone from leftover ham; 1.5 cups kale or spinach (, stems removed and finely chopped); 2-3 carrots (, diced)