Cook the bacon in a large Dutch oven over medium heat. Once the bacon is cooked, remove it and place it on a paper towel.
Remove all but 1 tablespoon of bacon grease from the Dutch oven, then add the onion, carrots, and celery, and sauté for 2-3 minutes. Add the garlic and cook, stirring constantly, for 1 minute.
Add the tomatoes, sea salt, freshly cracked pepper, cumin, and crushed red pepper; stir and cook for 2-3 minutes.
Add the chicken broth, lentils, and bay leaf, stir, then cover and simmer for 1 hour.
Remove the bay leaf, then blend the soup for 30 seconds with an immersion blender, if desired.
Add the fresh chopped kale to the soup and simmer for 10 minutes.
Ladle into bowls and serve with the bacon bits sprinkled on top. Enjoy.