Lentil Soup without bouillon macaroni

1 large onion , sliced thin 3 tablespoons butter 3 teaspoons sugar 3 cups red lentils 4 cups chicken stock (or veggie stock) 4 cups water 1/2 teaspoon cayenne[...]

1 lb lentils (any kind will work) 6 slices bacon 1 large carrot , diced 1 small onion , chopped 1 piece celeriac or 1 cup loosely packed celery leaves 2[...]