In a large pot bring 4 quarts water to a rolling boil.
Add salt to taste; add red lentil sedanini and stir gently.
Return to a boil and cook 5 to 6 minutes.
Remove from heat, drain and rinse.
Add caramelized onions, Brussel sprouts, and marinara to the pasta.
Heat until everything is heated through and coated in sauce.
Add red chili pepper flakes as a garnish to taste and serve.
Substitute with any protein-based pasta, sauce, and vegetables.