Next time I make 15 bean soup with chilis, I’ll try the HOT SOAK method of preparing the beans suggested by hurstbeans:
HOT SOAK: The Hot Soak is the recommended method for soaking beans, as it reduces actual cooking time and produces consistently tender beans.
1. Place beans in a large pot and add 10 cups of water for every 2 cups of beans.
2. Heat to boiling and boil for an additional 2 to 3 minutes.
3. Remove beans from heat, cover and let stand for 4 to 24 hours.
4. Drain beans and discard soak water.
5. Rinse beans with fresh, cool water.
This method should make the beans more tender and that would be a good thing. For the best flavor remember to add the herbs and spices near the end of cooking.