Rinse Lentils, pick through and discard any debris. Heat oil in a large pot over medium-high heat. Add onions and bell pepper (and carrots/celery is you’re including them) and sauté for 5 mins or until brown. Stir in cumin and red pepper flakes and cook for 1 more minute. Add chicken (or veggie) broth, lentils and rice. Bring to a boil. Reduce heat to low, cover and cook for 20 minutes. Add salt, stir and cook for an additional 30 minutes.