Rinse the lentils and cull them for small stones and debris. Remove sausages from casing and place into a heavy 4-quart pot with a tight fitting lid. Lightly brown sausage and break into smaller pieces. Add celery, onion, and corn to the pot. Saute mixture until vegetables soften.
Pour in the water, and add the salt and a few grindings of black pepper. Add lentils. Stir all the ingredients together, cover, and bring to a boil over medium heat, stirring occasionally.
Reduce the heat and simmer for about 2 hours, stirring from time to time to prevent the lentils from burning. Remove lid for last 1/2 hour while simmering. When stew has reached desired consistency, add chopped cilantro as a garnish and serve piping hot in bowls. Eat with some good crusty sourdough bread and enjoy.