Soak beans in 1 gallon cold water for 8 hours. Drain when ready to use.
In a 2 gallon heavy pot cook the bacon pieces until well done. Do not undercook the bacon. Add 1/2 cup chopped garlic, 3 Tbsp cilantro and the chopped onions to hot bacon. Cook until onions are transparent. When onions are ready, add beans, cumin and chili powder. Stir and add 1/2 gallon cold water. Turn heat to medium low. Add salt and stir. Cook beans slowly until fork tender (approximately 1 hour), stirring constantly to avoid burning.
Add tomatoes, remaining garlic and cilantro. Serve.Makes 4 Source: