  1 can beans (I like navy beans, m'self) 2 small cans tomato sauce onion fresh cilantro green pepper garlic whatever the hell else you want Open the can of beans. Dump it in a pot. Open the cans of tomato sauce. Dump in the same pot. Slice the non-end, non-yucky, yes-edible bits of onion into the pot. Rinse off the cilantro and tear off bits to dump into the pot (alternately, shake in some dried cilantro). Slice in the green pepper, or not. Dump in some garlic, or garlic powder if you're a plebe. My grandma puts pumpkin pieces in her beans sometimes, but it's not necessary.
There's also these little envelopes of ham flavor you can dump in, although if you're doing it full bore you can also acheive the effect by frying a few small pieces of country (salt-cured) ham in the pot before adding the beans, etc. If the rice and beans are going to be a side dish, you can stop here. If it's going to be a main course, you can dump in some separately cooked meat or meat substitute (ground beef, bacon, crumbled soy burger, etc).
Simmer on medium high until it smells good and the onion is clear and limp. Stir once in a while so it doesn't burn at the bottom. Serve over white rice cooked separately, preferably in a nifty rice cooker which is only $20 at walmart, you cheap bastards. 
