In a large pot, combine the first 7 ingredients (water, red lentils, garlic, olive oil, onions, celery, and carrots) together, and bring to a boil.
Reduce the heat to medium and simmer for about 2 hours, making sure to keep the pot covered so the liquid doesn’t evaporate.
Except for the parsley, add the rest of the ingredients (tomato paste, bay leaf, chili powder, salt, tomatoes, curry powder) and let simmer for a few minutes longer.
Just before serving, stir in the ½ cup of freshly chopped parsley.