In the winter, I keep mirepoix on hand in the refrigerator or freezer as a quick base to many soups and stews. If you don't have it just add 2 cups of chopped onions, carrots and celery. Feel free to adjust the seasonings to your taste and this would also be good with some tomatoes added (when you add the lentils). If you want to make it vegetarian, omit the bacon and swap the chicken stock and bone broth for all vegetable stock.