Soak lentils: Add lentils to a bowl and cover with boiling water. Allow to soak for 30 minutes. If you skip this step, the lentils will come out undercooked.
Combine ingredients: Drain the soaked lentils and add to a rice cooker bowl. Thoroughly rinse the long-grain white rice and quinoa to avoid a gummy texture. Add to rice cooker bowl along with water (or vegetable broth).
Add the rice to the pot, along with the chicken broth, diced tomato sauce (do not drain the sauce), garlic, onion, butter and seasoning. Stir the ingredients together.
Set rice cooker to cook or start (depending on the cooker functions) and walk away!
When done, fluff with a fork and serve.
