1Rinse the black beans, pinto beans, kidney beans, and lentils, then soak them in water overnight.
Drain and rinse the soaked beans and lentils. Place them in a large pot and cover with fresh water. Bring to a boil, then reduce heat and simmer until beans are tender, about 1-2 hours.
While the beans are cooking, cook the long grain white rice according to package instructions and set aside.
Peel and dice the large potato into small cubes. Mince the garlic and finely chop the jalapeño, removing the seeds if less heat is desired.
In a separate pan, create a roux by heating the flour over medium heat until it's a light golden color. Slowly whisk in the milk to create a smooth mixture.
Once the beans are tender, add the diced potato, minced garlic, chopped jalapeño, and manwich sauce to the pot. Stir well.
Pour the roux into the bean mixture and stir until the chili thickens.
Allow the chili to simmer for an additional 10-15 minutes, or until the potatoes are tender.
Serve the spicy three-bean chili over the cooked rice. Enjoy!