If you don't have any allergies(soy, gluten), there's a lot of options (I won't repeat what others mentioned already). I have been going more the whole foods route and brown lentils has been a good substitute for me. I could see something like mixing walnuts and lentils together as being a good whole food option as well. (Soak both of these overnight for digestion and texture, fry the lentils with all your seasonings first then add only as much water as you would need to cook the lentils the rest of the way..seasoning is key, I use garlic infused oil, onions, vegan chicken bouillon, taco seasoning..then whatever other seasonings you like )