I always use Kosher salt in my kitchen! If using table salt, start with half the amount and adjust to taste, as it is much "saltier" by volume.
Instructions
Rinse your beans with water and sort through them. Discard and rocks, clumps of dirt or nasty looking beans.
In a large pot over medium heat add in the olive oil and diced onions, sauté until the onions are tender.
Cover the beans with about 3 inches of water. Bring to a simmer and cover. Cook the beans for about 4 hours, or until done.
Check on the beans often to ensure they have enough water and are not boiling.The beans are done when they are soft and mush easily.
Strain the beans, reserving the cooking liquid, and place them back in the pot, off of the heat. Mash the beans, keeping some of the beans in larger pieces. For creamier refried beans mash the beans completely.
Add some of the reserved cooking liquid back to the beans. Add enough to reach the desired consistency. Adjust your seasonings if needed.
Put the pot back on low heat to warm up. Enjoy!
Notes
Using a mixer to mash the beans works really well.I like to make refried beans with leftover beans. When I plan my weekly menu, I will have one day with a pot of beans then later in the week make a meal with refried beans. I just make a double batch of beans on the first day. They are even a great alternative to store bought bean dip!