Wash the uncooked rice and add it to a mixture of tomato puree and water.

Cut the pimentos and yellow onion into small pieces.

Add the chopped pimentos, chopped yellow onion, salt, and oleo to the rice, tomato puree, and water mixture.

Bring the mixture to a boil and cook for 5 minutes.

Transfer the mixture to a casserole dish.

Bake in a preheated oven at 400°F (200°C) for 1 hour.

Sprinkle grated cheese over the top of the casserole.

Brown the cheese under a broiler or by leaving in the oven for a few more minutes.