To make quick refried beans, drain the cooking water from the cooked beans, making sure to reserve 1 cup of the cooking liquid. Saute half of a finely chopped onion in oil or lard. You can add garlic if you like. Add the cooked beans and 1/2 cup of the reserved cooking liquid. Use a potato masher to mash the beans into the onion until the beans have the texture you want. Add more liquid if necessary. Season with salt. Add lime, grated cheese, cilantro, etc... if you like!