Cover pot, bring to a boil, and simmer 35-40 mins.
Add salt & pepper (and bouillon cube, if using), and simmer another 10 mins. Add spinach or kale toward the end of this 10 mins and stir the soup to incorporate the greens.
Add a splash of red wine vinegar, if using. Season with a little more salt and pepper, to taste.
And, Serve!
Recipe by Naturopathic By Nature at https://naturopathicbynature.com/luscious-lentil-soup-gluten-free-dairy-free-vegan/