Pick over and rinse beans several times. Put beans in slow cooker and cover with chicken stock. Add onion, cumin, chile powder and meat. Bring to boil. Reduce heat and simmer for 1 1/2 hours, stirring occasionally.
Add salt. Allow beans to cook for 4 more hours.
NOTE: For thicker beans, when beans are tender, purée (about 1 cup of beans with some cooking liquid in blender and return to pot.
Servings: 8