Soak the lentils in cold water the evening before.
The next day, strain the lentils and put them in a saucepan. Wash, peel and cut the carrots and potatoes into cubes. Add the meat stock and the diced bacon to the lentils. Cook the stew for 25 to 30 minutes.
Finally, season with salt, pepper, sage and rosemary. I always use dried herbs, you can also use fresh ones.