Heat up the bacon fat in a pot over medium heat. When the grease is hot add the jalapeno and onion and sauté for a couple of minutes. Season with salt and pepper.
Open the canned beans and drain one of the cans. Add the beans to the pot.
Add the garlic salt and cumin and stir well.
Bring the beans to a boil over medium heat and cover.
Reduce the heat to low and simmer for about 20 minutes.
After simmering take a potato masher and mash the beans to desired consistency.
After mashing add the grated cheese and stir.
Serve in bowls and garnish with some chopped cilantro.