Source: Ecological Cooking
Date tried: January 13, 2018
Yield: 6 servings (about 1 1/2 quarts)
Time needed: 3 hours if beginning with dried beans
This makes a large quantity of sauce and I think 6 servings is an underestimate. The final simmering is best done in a slow cooker so, starting with dried beans and the necessary pre-soaking as well as the time to cook the beans, then 4 or more hours in the slow cooker, one needs to plan for a two-day project.
Out of that possibly only 20 minutes is active preparation.
The resulting sauce is quite pleasant though. I think I will find plenty of uses for it.