Cover the lentils with cold water, bring to a boil, drain and rinse in cold water and drain again.
Saute the onions and garlic in the olive oil in a large pot.
Add the sauce, salt, seasonings, and broth and bring to a boil.
Add the drained lentils and the celery and cook for 20 - 30 minutes.
Add the cooked beans and red bell peppers and cook for 10 more minutes.
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