Add a clean water into a pot, and allow to boil, add beans, boiled it half cooked. add your rice, salt, parboiled them all together.

After that, add the parboiled rice and beans, allow the water to soaked, and well cooked all together.

Sliced your onions and add.

Cut your lettuce into sliced, tomatoes, onions.

Yummy, served with baked beans.