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).
Start: Stir and set to cook on the 'White Rice' or 'Standard' setting.
Finish steaming: Don't open the rice cooker immediately once it finishes cooking. Allow it to keep steaming on the 'Warm' setting for about 5 minutes to ensure everything is perfectly cooked.
Fluff: Use the rice paddle to gently fluff the rice and incorporate the quinoa and lentils.
