Easy Slow Cooker Lentil Soup Recipe. Looking for recipes and ideas for easy weeknight meals cooked in crockpots or crock pots? This healthy meals full of plant based proteins thanks to the pulses! Gluten free, dairy free, vegan, and vegetarian, so it's easy to eat your veggies. You'll need vegetable broth or stock, tomatoes, onions, carrot, celery, green lentils, garlic, tomato paste, and spices.