Source : allrecipes.com
Ingredients for 15 :
1 onion, peeled and halved
3 cups dry pinto beans, rinsed
½ fresh jalapeno pepper, seeded and chopped
2 tbs minced garlic
5 tsp salt
1¾ tsp fresh ground black pepper
1/8 tsp ground cumin, optional
9 cups water
Place the onion, rinsed beans, jalapeno, garlic, salt, pepper, and cumin into a slow cooker. Pour in the water and stir to combine. Cook on High for 8 hours, adding more water as needed.
Note: if more than 1 cup of water has evaporated during cooking, then the temperature is too high.
Once the beans have cooked, strain them, and reserve the liquid. Mash the beans with a potato masher, adding the reserved water as needed to attain desired consistency.
So good! Will not serve 15 however, maybe 8-10 at most.